Unit 9 Review (Solving Quadratics)

Solve by graphing (Lesson 9.2).

• -2 and 3

• -1/2 and -6

• -2 and -6

• 3 and -6

Solve by graphing (Lesson 9.2).

• -1 and -3

• 1 and -3

• 1 and 3

• -1 and 3

Solve using intercept form (Lesson 9.2 - Part B). What are the x-intercepts of the parabola

y = ¼(x + 2)(x - 6)?

• -2 and 6

• 2 and -6

• -2

• ¼ and -2 and 6

Solve using intercept form (Lesson 9.2 - Part B). What are the x-intercepts of the parabola?

y = -3(x + 5)(x - 9)

• -5 and 9

• 5 and -9

• 5 and 9

• -3 and 5 and -9

Solve by using square roots (Lesson 9.3).

(x+6)²=49

• x=7,12

• x=±7

• x=1,-13

• x=43,-55

Solve by using square roots (Lesson 9.3).

x² = 49

• -7

• 7

• 49

• ±7

Solve by using square roots (Lesson 9.3).

3x² = -60

• no real solutions

• √20

• -2√5

• -√20

Solve by completing the square (Lesson 9.4). What needs to be moved in this equation (refer to your steps)?

x² = 9 - 4x

• the -4x

• the 9

• the x²

What is the first step to solving this equation if you solve by completing the square (Lesson 9.4)?

a² + 10a + 21 = 0

• Set the equation equal to zero

• Divide 10 by 2 and add the result to both sides

• Add a² and 10a together

• Subtract the 21

Solve by completing the square (Lesson 9.4).

n² = 18n + 40

• {11 and -11}

• {16 and 2}

• {20 and -2}

• {10 and -4}