Question

What is the right answer ?

Answer 1

`4x^2-7x+16`

Explanation:

Let's expand the quadratic.

`color(red)((x+4)^2)color(blue)(+3x(x-5))=color(red)(x^2+8x+16)color(blue)(+3x^2-15x)`

Add like terms

`color(green)(x^2)+color(purple)(8x)+16+color(green)(3x^2)color(purple)(-15x)=color(green)(4x^2)color(purple)(-7x)+16`

`=E`