Question

What is the standard form of `y= (4x+x^2)(x-7) -(2x+3)^2`?

Answer 1

`y=x^3-7x^2-40x-9`

Explanation:

Multiplying out:
`y=4x^2+x^3-28x-7x^2-(4x^2+9+12x)`
so we get

`y=4x^2+x^3-28x-7x^2-4x^2-9-12x`
Combining likewise terms
`y=x^3-7x^2-40x-9`