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Math Help - Functions and relations, need help desperately!

  1. #1
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    Exclamation Functions and relations, need help desperately!

    If f(x) = 3^x find x when f(x)= 1/27

    if f(x) = x^3 - 1 find f(k) as a product of factors

    given f(t) = t^4 + t^2 - 5 find the value of f(b)- f(-b)

    please show working need help desperately!?!
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  2. #2
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    Re: Functions and relations, need help desperately!

    Hey takkaz.

    Hint: If 1/27 = 3^(x) then by log laws, log_3(1/27) = log_3(3^x) = x. Can you find a number a such that 3^(a) = 1/27 (Hint: a will be negative).
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