Andy C. answered • 11/01/17

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G +h = 4x^2 + 2x

g * h = 8x^3

g-h = 2x - 4x^2

So (g-h)(-1) = 2(-1) - 4(-1)^2 = 2(-1) - 4(1) = -2 - 4 = -6

Note that g(-1) = -2 and h(-1) = 4 and -2 - 4 = -6