Solve by Factoring: 3x2 = -9x What are the solutions for x
i got x=0 and x=3 correct or no?

Question

Solve by Factoring: 3x2 = -9x What are the solutions for x
i got x=0 and x=3 correct or no?

anonymous · Answer

no.

anonymous · Answer

x=0 and x=-3

anonymous · Answer

^ that's correct.

anonymous · Answer

so they dont have to equal zero?

anonymous · Answer

most or i thought all had to equal zero

anonymous · Answer

You make it equal zero to find it, yes.

anonymous · Answer

3x2 =12x

3x2 - 12x = 0
3x(x - 4) = 0
3x = 0      or      x - 4 = 0

 x = 0       or        x = 4  thats an ex. from my book
and isnt 3 x -3= 9 im confused

anonymous · Answer

No, since you don't have a constant in that quadratic. To find the zeroes, just factor out an x.

3x^2 + 9x
x(3x+9)

x = 0 and 3x + 9 = 0

anonymous · Answer

Your original question was 3x^2 = -9x
For 3x^2 = 12x, it would be:

x(3x-12)
x = 0 and 3x -12 = 0

anonymous · Answer

ok in other words i should just plucked them in to see what worked to equal -9 not  zero

anonymous · Answer

You're confusing me, I'm not sure what you mean.