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Math Help - solve 3^(2x+1) - 26(3^x) - 9 = 0

  1. #1
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    solve 3^(2x+1) - 26(3^x) - 9 = 0

    does anyone know how i make this look like a quadratic? im guessing thats whats uv gotta do. cheers
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by 24680 View Post
    does anyone know how i make this look like a quadratic? im guessing thats whats uv gotta do. cheers
    3^(2x+1) - 26(3^x) - 9 = 0

    3 (3^x)^2 -26 3^x - 9 = 0

    so let y=3^x, then we have:

    3 y^2 -26 y -9 = 0

    RonL
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