Supplemental Worksheet Problems To Accompany: The Algebra 2 Tutor Section 15 The Quadratic Formula

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1 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor Supplemental Worksheet Problems To Accompany: The Algebra Tutor Please watch Section 15 of this DVD before working these problems. The DVD is located at: Sample Videos For this DVD Are Located Here: Page 1

2 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 1) Solve the equation using the quadratic formula: x + 5x+ = 0 ) Solve the equation using the quadratic formula: x x 1 = 0 Page

3 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 3) Solve the equation using the quadratic formula: 3 x + x = 0 ) Solve the equation using the quadratic formula: 6 8 x x+ = 0 Page 3

4 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 5) Solve the equation using the quadratic formula: x + 1= 8x Page

5 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor Question Answer 1) Solve the equation using the quadratic formula: x + 5x+ =0 Begin. a = 1 b = 5 c = First, label a, b, and c form the equation in the problem. a is the coefficient of x, b is the coefficient of x, and c is the constant term. ± b b ac a Write down the Note that every quadratic formula will always yield two solutions for x because of the ± in the ( ) ± 1 Plug in the values of a, b and c into the 5± Begin simplifying under the radical. 5± 9 Do the subtraction under the radical. Do the multiplication in the denominator. (continued on next page) Page 5

6 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 5± 3 Do the square root Write one solution with the + and another for the - in the expression. 5 3 Do the addition/subtraction in the numerators. 8 1 Do the divisions. Note that the quadratic formula always yields two answers which is what we would expect for a polynomial whose highest exponent is a. Ans: 1 Page 6

7 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor Question Answer ) Solve the equation using the quadratic formula: x x 1 = 0 Begin. a = 1 b = 1 c = 1 First, label a, b, and c form the equation in the problem. a is the coefficient of x, b is the coefficient of x, and c is the constant term. ± b b ac a Write down the Note that every quadratic formula will always yield two solutions for x because of the ± in the ( ) ( 1) ( 1) 1 ( 1) ± 1 Plug in the values of a, b and c into the ( 1) 1 ( 8) ± 1 Begin simplifying under the radical. 1± 9 Do the subtraction under the radical. Do the multiplication in the denominator. (continued on next page) Page 7

8 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 1± 7 Do the square root Write one solution with the + and another for the - in the expression Do the addition/subtraction in the numerators. 6 3 Do the divisions. Note that the quadratic formula always yields two answers which is what we would expect for a polynomial whose highest exponent is a. Ans: 3 Page 8

9 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor Question Answer 3) Solve the equation using the quadratic formula: x 3x + =0 Begin. a = b = 3 c = First, label a, b, and c form the equation in the problem. a is the coefficient of x, b is the coefficient of x, and c is the constant term. ± b b ac a Write down the Note that every quadratic formula will always yield two solutions for x because of the ± in the ( ( )) ± 3 3 Plug in the values of a, b and c into the ( ) 3± 9 16 Begin simplifying under the radical. 3± 5 Do the subtraction under the radical. Do the multiplication in the denominator. (continued on next page) Page 9

10 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 3± 5 Do the square root Write one solution with the + and another for the - in the expression. 3 5 Do the addition/subtraction in the numerators. 8 1 Do the divisions. Note that the quadratic formula always yields two answers which is what we would expect for a polynomial whose highest exponent is a. Ans: 1 Page 10

11 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor Question Answer ) Solve the equation using the quadratic formula: 6x 8x + =0 Begin. a = 6 b = 8 c = First, label a, b, and c form the equation in the problem. a is the coefficient of x, b is the coefficient of x, and c is the constant term. ± b b ac a Write down the Note that every quadratic formula will always yield two solutions for x because of the ± in the ( 8) ( 8) ( 6 ) ± 6 Plug in the values of a, b and c into the ( 8) 6 ( 8) ± 6 Begin simplifying under the radical. 8± 16 1 Do the subtraction under the radical. Do the multiplication in the denominator. (continued on next page) Page 11

12 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 8± 1 Do the square root Write one solution with the + and another for the - in the expression Do the addition/subtraction in the numerators Do the divisions. Note that the quadratic formula always yields two answers which is what we would expect for a polynomial whose highest exponent is a. Ans: Page 1

13 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor Question Answer 5) Solve the equation using the quadratic formula: x x + 1= 8x + 8x+ 1= 0 Begin. This is not in standard form. Add 8x to both sides to put it in standard form. a = 1 b = 8 c = 1 First, label a, b, and c form the equation in the problem. a is the coefficient of x, b is the coefficient of x, and c is the constant term. ± b b ac a Write down the Note that every quadratic formula will always yield two solutions for x because of the ± in the ( ) ± 1 Plug in the values of a, b and c into the 8± 6 Begin simplifying under the radical. 1 8± 60 Do the subtraction under the radical. Do the multiplication in the denominator. (continued on next page) Page 13

14 008 Jason Gibson / MathTutorDVD.com The Algebra Tutor 8± 15 To simplify the radical, use the factor tree: Write one solution with the + and another for the - in the expression Split up into two fractions to easier see what to do next Do the division in the fractions. 15 Ans: Page 1

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