Homework Answers

1. x = 3 & -42. x = 6 & -53. x = -1 & -74. x = 1 & 95. x = 6 & -26. x = -87. x = -10 & 108. x = -3 & -59. x = 2 & 1010.x = -8 & -4

11.x = -4 & 412.x = -8 & 713.x = 8 & -314.x = 415.x = 416.x = -6 & -817.x = 8 & -318.x = 10 & -519.x = 12 & -220.x = -7 & 2

TUESDAY, APRIL 3, 2012

OBJECTIVE: I CAN FIND SOLUTIONS TO QUADRATIC EQAUATIONS BY USING

SQUARE ROOTS.

Use Square Roots to Solve Quadratic Equations

Use Square Roots to Solve Quadratics

If there is not an x term, we can use square roots to find the zeros.

Goal: get x2 alone on one side of the equation. Then you’ll be able square root each side to find x.

When you take the square root of a number, your solution will have a positive version and a negative version. We can abbreviate this with the sign: ±

2x2 = 8x2 = 4x = ± √4x = ± 2

(check your answer by putting the answers into the original equation)

Use Square Roots to Solve Quadratics

x2 – 18 = -9

Use Square Roots to Solve Quadratics

x2 + 12 = 5

Use Square Roots to Solve Quadratics

x2 = 9

Use Square Roots to Solve Quadratics

x2 – 35 = 1

Use Square Roots to Solve Quadratics

3x2 – 11 = 7

Use Square Roots to Solve Quadratics

6(x – 4)2 = 42

Use Square Roots to Solve Quadratics

3(x + 5)2 = 24

Homework

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