Quadratic Equations Review

To complete the perfect square trinomial in the expression x²-22x+_____, we need to add

• 11

• 44

• 121

• 144

In the quadratic formula, the expression
b²-4ac is called

• discrim

• determinant

• discriminant

• none of these

If 3+2i is one solution of a quadratic equation, then the other solution of this quadratic equation is

• 2-3i

• 3+2i

• 1/3 -1/2i

• 3-2i

Fill the blank spaces to complete the perfect square trinomial

x²-18x+____=(x- ____)²

• 9 and 3 respectively

• 81 and 9 respectively

• -9 and -3 respectively

• -81 and -9 respectively

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.

Solve by factoring: x² = 7x + 18

• -7 and -18

• 9 and 2

• 9 and -2

• 2 and 7

Solve: (x - 2) ² = 49

• 9 or -5

• ± 9

• ± 5

• ± 7

Find the missing value "c" to create a perfect square trinomial:
x² – 8x  + ___ 

• -4

• 16

• 4

• 8

When factoring
x² - 4x + 4 = 20,
what goes in the blank?
(x - __ )² = 20

• 4

• 2

• 8

• 20

Find the discriminant:

2a² - 5a + 5 = 0

• 44

• -15

• 65

• -144