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Practice the questions given in the worksheet on quadratic formula. We know the solutions of the general form of the quadratic equation ax\(^{2}\) + bx + c = 0 are x = \(\frac{-b \pm \sqrt{b^{2} - 4ac}}{2a}\). 1. Answer the following: (i) Is it possible to apply quadratic formula in the equation 2t\(^{2}\) +(4t - 1)(4t + 1) = 2t(9t - 1) (ii) What type of equations can be solved using quadratic formula? (iii) Applying quadratic formula, solve the equation (z - 2)(z + 4) = - 9 (iv) Applying quadratic formula in the equation 5y\(^{2}\) + 2y - 7 = 0, we get y = \(\frac{k ± 12}{10}\), What is the value of K? (v) Applying quadratic formula in a quadratic equation, we get m = \(\frac{9 \pm \sqrt{(-9)^{2} - 4 ∙ 14 ∙ 1}}{2 ∙ 14}\). Write the equation. 2. With the help of quadratic formula, solve each of the following equations: (i) x\(^{2}\) - 6x = 27 (ii) \(\frac{4}{x}\) - 3 = \(\frac{5}{2x + 3}\) (iii) (4x - 3)\(^{2}\) - 2(x + 3) = 0 (iv) x\(^{2}\) - 10x + 21 = 0 (v) (2x + 7)(3x - 8) + 52 = 0 (vi) \(\frac{2x + 3}{x + 3}\) = \(\frac{x + 4}{x + 2}\) (vii) x\(^{2}\) + 6x - 10 = 0 (viii) (3x + 4)\(^{2}\) - 3(x + 2) = 0 (ix) √6x\(^{2}\) - 4x - 2 √6 = 0 (x) (4x - 2)\(^{2}\) + 6x - 25 = 0 (xi) \(\frac{x - 1}{x - 2}\) + \(\frac{x - 3}{x - 4}\) = 3\(\frac{1}{3}\) (xii) \(\frac{2x}{x - 4}\) + \(\frac{2x - 5}{x - 3}\) = 8\(\frac{1}{3}\) Answers for the worksheet on quadratic formula are given below. Answers: 1. (i) No (ii) Quadratic equation in one variable (iii) -1, -1 (iv) K = -2 (v) 14m\(^{2}\) - 9m + 1 = 0 2. (i) -3 or 9 (ii) -2 or 1 (iii) x = \(\frac{3}{2}\) or \(\frac{1}{8}\) (iv) 3 or 7 (v) x = -\(\frac{4}{3}\) or \(\frac{1}{2}\) (vi) ±√6 (vii) -3 ± √19 (viii) x = -\(\frac{5}{3}\) or -\(\frac{2}{3}\) (ix) √6 or -\(\frac{√6 }{3}\) (x) x = -\(\frac{7}{8}\) or \(\frac{3}{2}\) (xi) 2\(\frac{1}{2}\) or 5 (xii) 3\(\frac{1}{13}\) or 6 Quadratic Equation Introduction to Quadratic Equation Formation of Quadratic Equation in One Variable Solving Quadratic Equations General Properties of Quadratic Equation Methods of Solving Quadratic Equations Roots of a Quadratic Equation Examine the Roots of a Quadratic Equation Problems on Quadratic Equations Quadratic Equations by Factoring Word Problems Using Quadratic Formula Examples on Quadratic Equations Word Problems on Quadratic Equations by Factoring Worksheet on Formation of Quadratic Equation in One Variable Worksheet on Quadratic Formula Worksheet on Nature of the Roots of a Quadratic Equation Worksheet on Word Problems on Quadratic Equations by Factoring 9th Grade Math From Worksheet on Quadratic Formula to HOME PAGE New! CommentsHave your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question. Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.
Quadratic Equations and Functions Learning ObjectivesBy the end of this section, you will be able to:
Before you get started, take this readiness quiz.
Solve Quadratic Equations Using the Quadratic FormulaWhen we solved quadratic equations in the last section by completing the square, we took the same steps every time. By the end of the exercise set, you may have been wondering ‘isn’t there an easier way to do this?’ The answer is ‘yes’. Mathematicians look for patterns when they do things over and over in order to make their work easier. In this section we will derive and use a formula to find the solution of a quadratic equation. We have already seen how to solve a formula for a specific variable ‘in general’, so that we would do the algebraic steps only once, and then use the new formula to find the value of the specific variable. Now we will go through the steps of completing the square using the general form of a quadratic equation to solve a quadratic equation for x. We start with the standard form of a quadratic equation and solve it for x by completing the square.
Quadratic Formula The solutions to a quadratic equation of the form ax2 + bx + c = 0, where  To use the Quadratic Formula, we substitute the values of a, b, and c from the standard form into the expression on the right side of the formula. Then we simplify the expression. The result is the pair of solutions to the quadratic equation. Notice the formula is an equation. Make sure you use both sides of the equation. How to Solve a Quadratic Equation Using the Quadratic Formula Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve a quadratic equation using the quadratic formula.
If you say the formula as you write it in each problem, you’ll have it memorized in no time! And remember, the Quadratic Formula is an EQUATION. Be sure you start with “x =”. Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: When we solved quadratic equations by using the Square Root Property, we sometimes got answers that had radicals. That can happen, too, when using the Quadratic Formula. If we get a radical as a solution, the final answer must have the radical in its simplified form. Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: When we substitute a, b, and c into the Quadratic Formula and the radicand is negative, the quadratic equation will have imaginary or complex solutions. We will see this in the next example. Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Remember, to use the Quadratic Formula, the equation must be written in standard form, ax2 + bx + c = 0. Sometimes, we will need to do some algebra to get the equation into standard form before we can use the Quadratic Formula. Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: When we solved linear equations, if an equation had too many fractions we cleared the fractions by multiplying both sides of the equation by the LCD. This gave us an equivalent equation—without fractions— to solve. We can use the same strategy with quadratic equations. Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Think about the equation (x − 3)2 = 0. We know from the Zero Product Property that this equation has only one solution, x = 3. We will see in the next example how using the Quadratic Formula to solve an equation whose standard form is a perfect square trinomial equal to 0 gives just one solution. Notice that once the radicand is simplified it becomes 0 , which leads to only one solution. Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Solve by using the Quadratic Formula: Use the Discriminant to Predict the Number and Type of Solutions of a Quadratic EquationWhen we solved the quadratic equations in the previous examples, sometimes we got two real solutions, one real solution, and sometimes two complex solutions. Is there a way to predict the number and type of solutions to a quadratic equation without actually solving the equation? Yes, the expression under the radical of the Quadratic Formula makes it easy for us to determine the number and type of solutions. This expression is called the discriminant. Discriminant
Let’s look at the discriminant of the equations in some of the examples and the number and type of solutions to those quadratic equations.
Using the Discriminant, b2 − 4ac, to Determine the Number and Type of Solutions of a Quadratic Equation For a quadratic equation of the form ax2 + bx + c = 0,
Determine the number of solutions to each quadratic equation. ⓐ To determine the number of solutions of each quadratic equation, we will look at its discriminant. ⓐ Since the discriminant is positive, there are 2 real solutions to the equation. ⓑ Since the discriminant is negative, there are 2 complex solutions to the equation. ⓒ Since the discriminant is 0, there is 1 real solution to the equation. Determine the numberand type of solutions to each quadratic equation. ⓐ ⓐ 2 complex solutions; ⓑ 2 real solutions; ⓒ 1 real solution Determine the number and type of solutions to each quadratic equation. ⓐ ⓐ 2 real solutions; ⓑ 2 complex solutions; ⓒ 1 real solution Identify the Most Appropriate Method to Use to Solve a Quadratic EquationWe summarize the four methods that we have used to solve quadratic equations below. Methods for Solving Quadratic Equations
Given that we have four methods to use to solve a quadratic equation, how do you decide which one to use? Factoring is often the quickest method and so we try it first. If the equation is What about the method of Completing the Square? Most people find that method cumbersome and prefer not to use it. We needed to include it in the list of methods because we completed the square in general to derive the Quadratic Formula. You will also use the process of Completing the Square in other areas of algebra. Identify the most appropriate method to solve a quadratic equation.
The next example uses this strategy to decide how to solve each quadratic equation. Identify the most appropriate method to use to solve each quadratic equation. ⓐ ⓐ Since the equation is in the ⓑ We recognize that the left side of the equation is a perfect square trinomial, and so factoring will be the most appropriate method. ⓒ While our first thought may be to try factoring, thinking about all the possibilities for trial and error method leads us to choose the Quadratic Formula as the most appropriate method. Identify the most appropriate method to use to solve each quadratic equation. ⓐ ⓐ factoring; ⓑ Square Root Property; ⓒ Quadratic Formula Identify the most appropriate method to use to solve each quadratic equation. ⓐ ⓐ Quadratic Forumula; ⓑ Factoring or Square Root Property ⓒ Square Root Property Key Concepts
Practice Makes PerfectSolve Quadratic Equations Using the Quadratic Formula In the following exercises, solve by using the Quadratic Formula. Use the Discriminant to Predict the Number of Real Solutions of a Quadratic Equation In the following exercises, determine the number of real solutions for each quadratic equation. Identify the Most Appropriate Method to Use to Solve a Quadratic Equation In the following exercises, identify the most appropriate method (Factoring, Square Root, or Quadratic Formula) to use to solve each quadratic equation. Do not solve. Writing ExercisesSolve the equation ⓐ by completing the square ⓑ using the Quadratic Formula ⓒ Which method do you prefer? Why? Answers will vary. Solve the equation ⓐ by completing the square ⓑ using the Quadratic Formula ⓒ Which method do you prefer? Why? Self Checkⓐ After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.
ⓑ What does this checklist tell you about your mastery of this section? What steps will you take to improve? GlossarydiscriminantIn the Quadratic Formula,How do you solve using the quadratic formula?The quadratic formula helps us solve any quadratic equation. First, we bring the equation to the form ax²+bx+c=0, where a, b, and c are coefficients. Then, we plug these coefficients in the formula: (-b±√(b²-4ac))/(2a) . See examples of using the formula to solve a variety of equations.
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Solving using the quadratic formula worksheet answers
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