Solving quadratic equations

Solve. x²+13x+40 = 0

• -8,5

• -40,-1

• 5,8

• -8,-5

Solve.

2x²-128 =0

• -8,8

• 32

• 8

• -16,16

Solve.

2x²-15x =0

• 0

• 15/2, 15

• 15/2, 0

• 15/2

Solve.

x² =121

• 60.5

• -11, 11

• -12, 12

• 11

Solve.
x2-8x+11 =0

•  $-4+\sqrt{5}$  ,  $4+\sqrt{5}$  

•  $8+\sqrt{5},\ 8-\sqrt{5}$  

•  $4+\sqrt{5\ },\ 4-\sqrt{5}$  

•  $-8+2\sqrt{5},\ -8-\sqrt{5}$  

Solve.

x²+5x-36 =0

• -9, 1

• -9, 4

• 9, 4

• 9, -4

Solve.

x²+6x+8 =0

• 8,0

• 2, 4

• 2, -4

• -2,-4

Solve.

x² = -7x +6

• 3, 1/2

• -1, -6

• $\frac{7\pm\sqrt{73}}{2}$

• $\frac{-7\pm\sqrt{73}}{2}$

Solve.

8x²-6x = -1

• $\frac{1}{2},\frac{1}{4}$

• 2, $\frac{1}{4}$

• $\frac{-1}{2},\frac{1}{4}$

• $\frac{1}{2},4$

What do each equation have to equal before you can start to solve by factoring or quadratic formula?

• has to equal 1

• has to equal x

• has to equal 0

• has to equal itself