Question

How do I find the cube of `(2 x + 5)`?

Answer 1

`8x^3+65x^2+150x+125`

Explanation:

`(2x+5)` cubed = `(2x+5)^3`

`(2x+5)^3 = (2x+5)(2x+5)(2x+5)`

First, do `(2x+5)(2x+5)=4x^2+20x+25`

Now do the second part: `(4x^2+20x+25)(2x+5)`

`8x^3+65x^2+150x+125`