Quadratic Functions

The y-intercept of a quadratic equation is the ___.

• a

• b

• c

• x

Which equation is used to find the axis of symmetry?

• $x=-\frac{b}{2a}$

• $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

• $b^2-4ac$

• $\left(\frac{b}{2}\right)^2$

A quadratic equation has a minimum when ___

• a < 0

• a = 0

• a > 0

A quadratic equation has a maximum when ___

• a < 0

• a = 0

• a > 0

Which is not considered to be the solution of a quadratic equation?

• root(s)

• y-intercept(s)

• zero(s)

• x-intercept(s)

i =

• 1

• $\sqrt{1}$

• -1

• $\sqrt{-1}$

Choose the complex number(s).

• 3i

• 2x

• 6 + 7i

• 8x - 9

 $\frac{2+\ 5i}{7-3i}$  Which is the complex conjugate?

• 7 + 3i

• 7 - 3i

• 2 + 5i

• 2 - 5i

Check all factoring methods.

• GCF

• Grouping

• Completing the square

• Discriminant

Completing the square uses ___ to create a perfect square trinomial.

• $-\frac{b}{2a}$

• $\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

• $\left(\frac{b}{2}\right)^2$

• $b^2-4ac$