Question

How do you factorise this?`" "x^3 -3(x+1) -(x+9)`

Answer 1

`x^3-4x-12`

Explanation:

`x^3-\color(red)(3(x+1))-(\color(blue)(x+9))`
Distribute: `x^3-[\color(red)(3(x)+3(1))]-x-9`

`x^3-3x-3-x-9`
`x^3-4x-12`