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algebra/trig

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1. f(x)=x^3+5
does f(x) have an inverse? if so, find the inverse and decide if it is a function.

2. if f(x)= 3x+1 and g(x)= x^2-1, find
(f∙ g)(2)

3. if f(x)= (2x)^2, find f(-4)

thank you :)

  • algebra/trig -

    1. let y = x^3 + 5
    inverse is x = y^3 + 5
    y^3 = x-5
    y = (x-5)^(1/3)
    yes , it is a function

    2. (f∙ g)(2) = f(g(2))
    = f(3)
    = 10

    3. Come on, you can do this!

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