Question 647256
Hi, my name is Aaron I am in 10th grade and im in honors trig/pre-calc.
Factoring is mostly about practice.

Start by setting one side equal to zero.

3x^2+9x=0

we can factor out a 3x

3x(x+3)=0

which means x equals -3 or zero. 

I would really appreciate your recomendation, most touters are asleep, however I stayed up to help people who are staying up late struggling. Feel free to email me if you are having trouble still , good luck
-Aaron