Question

I am finding the roots of 9x^3 + 18 x^2 - 135x, I have gotten -3 and 5 but is 0 a zero as well?

Answer 1

So lets start from setting,
\(\large\color{black}{ x^3 + 18 x^2 - 135x=0 }\)

You see all terms have x in common, right ?

Answer 2

first thing you have to find GCF

Answer 3

\[9x^3 + 18 x^2 - 135x\]
\[9x(x^2+2-15)\]
\[9x(x+3)(x-5)\]

Answer 4

Cool!

Answer 5

you did one mistake though, that was a typo. 2x . second line