Question 83713
Solve by Factoring: 3x^2 = -9x 

What are the solutions for x? 
{{{3x^2=-9x}}}
{{{3x^3+9x=-9x+9x}}}
{{{3x^2+9x=0}}}
{{{3x(x+3)=0}}}
3x=0 or x+3=0
3x/3=0/3 or x+3-3=0-3
x=0 or x=-3
:
Proof:
if x=0
3(0)^2=-9(0)
0=0 True
if x=-3
3(-3)^2=-9(-3)
3(9)=-9(-3)
27=27 True
We're Right!!!
Happy Calculating!!!