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Math Help - Quick algebra help

  1. #1
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    Exclamation Quick algebra help

    i worked out the answer last night, but i need my working out and i forgot how i did it

    this is a small part of the equation, and the last part i need to figure out how i worked out.

    9h + 2(81 + h)= 230

    i already worked out that h= 4 but cant remember how so, and need to present working out.

    help =)
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  2. #2
    Senior Member Educated's Avatar
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    9h + 2(81 + h^2)= 230

    9h + 162 + 2h^2= 230

    2h^2 + 9h - 68 = 0

    Now factorise or use the quadratic formula to solve for h.
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  3. #3
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    thanks man, lol my brain just switched off today xD
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