na
it wants you to factor a 3, and you could get that comon x out of there but it only wants 3, out of that
it would go like this
divide that left side by 3
write it on the right side so it multiplies the 3 back in
3x^2 + 15x = 3(x^2 + 5x)
see how when you distribute that 3 into the right side, you get back the left side?
if you need more help just ask me bro
Hope this helps,
- Jeron :- )