Answer:
x³+3x²-28x
Step-by-step explanation:
(x-4)(x-0)(x+7)
(x-4)(x)(x+7)
(x-4)(x+7)=(x²+3x-28)
(x²+3x-28)(x)=x³+3x²-28x
The answer is 0 because when you plug in the 3 and the 8 into the equation and do order of operations you will get 0.
If x=8 {f(8)=3x+4}, the answer is 28.
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