Calculus

I'm not sure how to solve the equation 5^x-12*(5^-x)-1=0

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  1. multiply all terms by 5^x

    5^2x-12-5^x=0

    let u=5^x

    then u^2-u-12=0
    (u-4)(u-3)=0
    solve for u, substite back in, solve for x.

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    bobpursley

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