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If f(x)=x and g(x)=x+1 find the function and its domain:

1. gof

2. fof

  • math -

    (gof)(x) means you substitute the whole expression of f(x) to g(x):
    (gof)(x) = g(f(x)) = f(x) + 1
    (gof)(x) = x + 1

    for #2, we do the same,, we substitute f(x) to f(x):
    (fof)(x) = f(x)
    (fof)(x) = x

    hope this helps~ :)

  • math -

    Sweet! Thanks

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