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If f(x)= x2 + 2x - 6 and g(x)= 3x2 - 5x - 7, find f(x)-g(x).

A) -2x2 - 3x + 1
B) -2x2 + 7x + 1
C) -2x2 - 3x - 13 <my choice
D) 4x2 - 3x - 13

1 answer

f(x)-g(x)
= (x^2+2x-6)-(3x^2-5x-7)
= x^2+2x-6-3x^2+5x+7
= -2x^2+7x+1

watch those minus signs when subtracting!
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