1. To solve x2+12x=9 by completing thesquare, add

____ to both sides of the equation.

2.In order to solve x2=9x+9 by using the quadraticformula, use a=_______, b=_______, and c=_______.

3.Fill in the blank so that the resulting statement is true.

If the discriminant of ax2+bx+c=0 isnegative, the quadratic equation has______________ real solutions.

Use factoring to solve the quadratic equation. Check by substitution or by using a graphing utility and identifyingx-intercepts.

x22x63=0

Rewrite the equation in factored form.

_____=0

(Factor completely.)

The solution set is ____

(Use a comma to separate answers as needed. Type each solution onlyonce.)

4.Solve the equation by factoring.

9x2+21x8=0

Rewrite the equation in factored form.

_____=0

(Factor completely.)

The solution set is _____

(Use a comma to separate answers as needed. Type each solution onlyonce.)