solving quadratic equations

The solutions of the quadratic equation 
x²+2x-15=0 are

• x = 3 or x = 5
• x = 5 or x = -3
• x = -5 or x = 3
• x = -3 or x = -5

Convert x² - 9x + 20 to factored form and solve.

• (x-10)(x+2); x = -2, 10
• (x+4)(x+5); x = -5, -4
• (x-4)(x-5); x = 4, 5
• Not factorable

The solutions of the quadratic equation 
x²+12x+35=0 are

• x = -5 or x = -7
• x = 5 or x = 7
• x = -35 or x = -1
• x = -9 or x = -4

Factor x² + 6x + 9 and solve for x. 

• (x+3)(x+3); x = -3
• (x+4)(x+5); x=-4, -5
• (x-3)(x-3); x=3
• Not factorable

What are the solutions to this equation? (x-3)(x+2)=0

• x=3,-2
• x=-3,2
• x=2,3
• x=3,2

Solve by factoring.
x² + 2x - 8 = 0

• 4 and 2
• 4 and -2
• -4 and 2
• -4 and -2

Solve by factoring.
3a² - 12a + 12 = 0

• -2
• 2
• 2/3
• 5

Solve by factoring.
b² + 2b - 24 = 0

• x = 6 or x = -4
• x = -6 or x = -4
• x = 6 or x = 4
• x = -6 or x = 4

Solve by factoring.
z² - 6z - 27 = 0

• z = 3 or z = 9
• z = 3 or z = -9
• z = -3 or z = 9
• z = -3 or z = -9

Solve using quadratic formula.
x² + 7x - 7= 0

• A
• B
• C
• D