Question

Solve

1. 3x^2-9x=0

2. 12x^2+30x=-12

3. 9a(a+1)=4

4. 16x^2=25

Answer 1

Set each equation equal to 0.
Try to factor.
Set each factor equal to 0.
Solve for x.

I'll pick one of your problems to show you how to solve.

Let's try problem #2:
12x^2 + 30x = -12

Set the equation equal to 0:
12x^2 + 30x + 12 = 0

Try to factor:
(6x + 3)(2x + 4) = 0

Set each factor equal to 0:
6x + 3 = 0
2x + 4 = 0

I'll let you finish this to solve for x.
(Hint: there will be two possible solutions.)

Try this technique with your other problems.

I hope this will help get you started.