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March 28, 2017

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consider the functions f(x)=x^3-2 and g(x)=3 sqrt x+2:
a. find f(g(x))
b. find g(f(x))
c. determine whether the functions f and g are inverse of each other.
I have no clue where to even begin!

  • math - ,

    f(g) = g^3-2 = (3sqrt(x+2))^3-2 = 27(x+2)sqrt(x+2)-2
    g(f) = 3sqrt(f+2) = 3sqrt(x^3) = 3xsqrt(x)

    if they are inverses, g(f) = f(g) = x
    Obviously they are not inverses

  • math - ,

    thanks alot

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