Question:

If f (x) = 1 / x^2 and g (x) = 3x^2, then g(f(x)) = ?

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I got 3/x^4 too.. bah hum bug...

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  1. 1/(9x^4)


  2. g(1/x^2)=3(1/x^2)^2

    =3(1/x^4)

    =3/x^4

  3. To answer simply place the equation f(x) into the g(x) equation for x.

    f(x) = 1 / x^2

    g(x) = 3x^2

    g(f(x)) = 1 / (3x^2)^2

    g(f(x)) = 1 / 9x^4
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