algebra

2*5^(2x)-5^(x)-1=0

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asked by Clair
  1. let y = 5^x
    then
    2 y^2 - y - 1 = 0
    (2y+1)(y-1) = 0
    y = -1/2 or y = 1

    if 5^x = 1
    x = 0

    if 5^x = -1/2
    ln (5^x) = ln (-1/2)
    undefined, you may not take log of a negative number

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    posted by Damon

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