What is the right answer ?

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1 Answer
Mar 3, 2018

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