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Section 1.2 Quadratic Equations
1.
Section 1.2 Quadratic Equations
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
2.
Quadratic Equations
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
3.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
4.
Solve the equation:
x − 4x = 0 2 x( x − 4) = 0 x = 0 or x + 4 = 0 x = 0 or x − 4 The solution set is { 0, 4} Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
5.
Solve the equation:
x2 = 6 − x x + x−6 = 0 2 ( x + 3)( x − 2) = 0 x = −3 or x = 2 The solution set is { −3, 2} Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
6.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
7.
Solve each equation.
( x + 3) 2 (a) x = 7 2 (b) =9 x+3= ± 9 x=± 7 x + 3 = ±3 x = 7 or x = − 7 x + 3 = 3 or x + 3 = −3 x = 0 or x = −6 { The solution set is − 7, 7 } The solution set is { 0, −6} Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
8.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
9.
Solve by completing
the square: 2x2 + 6x − 5 = 0 2x + 6x = 5 2 3 19 x+ =± 2 4 2x2 6x 5 + = 2 2 2 19 3 x=± − 9 5 9 2 2 x + 3x + = + 2 4 2 4 19 − 3 19 − 3 x= or − 2 2 2 3 19 x+ = 2 4 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
10.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
11.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
12.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
13.
Use the quadratic
formula to find the real solutions if any, of the equation 2x − 4x +1 = 0 2 ax + bx + c = 0 2 b 2 − 4ac = (−4) 2 − 4(2)(1) = 16 − 8 = 8 b − 4ac > 0 so there are two real solutions 2 which can be found using the quadratic formula. Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
14.
Use the quadratic
formula to find the real solutions if any, of the equation 2x − 4x +1 = 0 2 −b ± b − 4ac 2 x= 2a −(−4) ± 8 4± 8 2± 2 x= = = 2(2) 4 2 2 + 2 2 − 2 The solution set is , 2 2 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
15.
Use the quadratic
formula to find the real solutions if any, of the equation 1 2 x − 6 x + 18 = 0 x 2 − 12 x + 36 = 0 2 ax 2 + bx + c = 0 b 2 − 4ac = (−12) 2 − 4(1)(36) = 144 − 144 = 0 b − 4ac = 0 so there is a repeated solution 2 which can be found using the quadratic formula. Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
16.
Use the quadratic
formula to find the real solutions if any, of the equation 1 2 x − 6 x + 18 = 0 x − 12 x + 36 = 0 2 2 ax 2 + bx + c = 0 −b ± b 2 − 4ac x= 2a −(−12) ± 0 12 x= = =6 The solution set is { 6} 2(1) 2 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
17.
Use the quadratic
formula to find the real solutions if any, of the equation 2x + 3 = 2x 2 Since b − 4ac < 0, 2 2x − 2x + 3 = 0 2 there is no real solution. ax 2 + bx + c = 0 b − 4ac = ( −2 ) − 4(2)(3) 2 2 = 4 − 24 = −20 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
18.
Use the quadratic
formula to find the real solutions if any, of the equation 1 2 −1 ± 49 −1 ± 7 6+ − 2 = 0 x= = x x 2(6) 12 6 x2 + x − 2 = 0 −1 + 7 1 = = 12 2 b − 4ac = ( 1) − 4(6)(−2) 2 2 −1 − 7 2 = =− = 1 + 48 = 49 12 3 Since b 2 − 4ac > 0, 1 2 The solution set is , − there are two real solutions. 2 3 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
19.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
20.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
21.
Copyright © 2012
Pearson Education, Inc. Publishing as Prentice Hall.
22.
9 ( x
− 18 ) = 144 ( x − 18) x − 18 = ±4 2 2 = 16 22 centimeters by 22 centimeters x = 18 ± 4 = 22 or 14 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.