Ch 9 Quiz Review

Solve by factoring: x² - 9x + 20 = 0

• x = -4 and x = -5
• x = 20 and x = -9
• x = 4 and x = 5
• x = -4 and x = 5

7x² - 26x - 8 = 0

• x = -1 and x = -7/8
• x = 4 and x = -2/7
• x = -4 and x = 2/7
• x = 4 and x = -7/2

Solve by taking square roots:
5b² - 4 = 41

• b = 9, b = -9
• b = 3, b = -3
• b = 8, b = -8
• no solution

Identify the 'b' value:
 y = 16x² - 8x - 24

• 16
• -8
• 8
• -24

Identify the 'a' value:
 y = 16x² - 8x - 24

• 16
• 8
• -8
• -24

ax²+bx+c=0  is the standard form of a quadratic equation.

• True
• False

What should you do first in solving this equation?
x² + 6x - 13 = 3

• Get factored form
• Write down: a=1, b=6, c=-13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

Factor Completely: 
x⁴-9x²

• x²(x+3)(x-3)
• (x²+3x)(x²-3x)
• (x²+9)(x-3)(x+3)
• x²(x²-9)

What is the axis of symmetry formula?

• y = mx+b

• y = ax²+bx+c

• b² - 4ac

• x = -b/2a

Which value is the vertex?

• (-4, 0)

• (-1, -9)

• (0, -8)

• (2, 0)