Math Algebra

f(x)=x^3+4 f=1, f=-1
Are the answer to this 5 and 3
I must not understand

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  1. f(x)=x^3+4

    f=1
    f(1)=(1)^3+4
    (1)^3=1 because 1X1X1=1
    1+4=5
    so f(1)=5

    f=-1
    f(-0)=(-1)^3+4
    (-1)^3=-1
    because -1x-1x-1=1x-1=-1
    -1+4=3
    so f(-1)=3

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