Question

Just the image below.

Answer 1

1) 2x^3-2x^2+4x+20

Explanation:

line up the equations, having each variable aligned with the similar variable, and distribute the minus sign across the parenthesis

7x^3 + 4x + 13

-(5x^3 + 2x^2 - 7)

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2x^3 - 2x^2 +4x +20