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Thread: Quadratics

  1. #1
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    Quadratics

    If we want to solve for x given:

    (5x + 4)2 - 2 = 7

    Then is it best to expand first? When I do this I get: 25x2+ 40x + 7=0

    Should I factor after this?

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  2. #2
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    Re: Quadratics

    you can expand, combine like terms, then factor. or ...

    $(5x+4)^2 = 9$

    $|5x+4| = 3$

    $5x +4 = 3 \implies x = -\dfrac{1}{5}$

    $5x+4 = -3 \implies x = -\dfrac{7}{5}$
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