# How do you factor: 3x^3 - 9x^2?

Apr 2, 2018

$3 {x}^{2} \left(x - 3\right)$

#### Explanation:

When factorising, take out ALL of the common factors

ie $3 \times x \times x \times x - 9 \times x \times x$

you notice that the common factors are 3 and 2 "x"
so you can factorise it to:
$3 {x}^{2} \left(x - 3\right)$