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Math Help - Solving quadratic finctions; plz help me solve for x

  1. #1
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    Solving quadratic finctions; plz help me solve for x

    Equation: (x+7)(x+2)=84
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  2. #2
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    Quote Originally Posted by runner940 View Post
    Equation: (x+7)(x+2)=84
    ohh, i think i can help

    (x+7)(x+2)=84
    x^2+14+9x-84=0
    x^2+9x-70
    factors of 70 that add up to 9: 14, -5
    (x+14)(x-5)=0
    x=5 or  x=-14
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