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Math Help - Determine when f(x)=48

  1. #1
    Senior Member sakonpure6's Avatar
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    Determine when f(x)=48

    we have the equation x^4 - 5x^2 + 4 and to find when the values of x give us 48 we do this : x^4 - 5x^2 + 4 = 48, then we try to factor. In this case we can not, so do we use the quadratic formula? The answers in the text book are 48 and -3.10 ? They are wrong... So what do i do?
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  2. #2
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    Re: Determine when f(x)=48

    Use the substitution y=x^2
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