SOLUTION: Please help me figure out this proble: (x(x+9))/2=18^2

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Question 635311: Please help me figure out this proble: (x(x+9))/2=18^2
Found 2 solutions by stanbon, Maths68:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Please help me figure out this proble: (x(x+9))/2=18^2
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x^2+9x = 2*324
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x^2+9x-648 = 0
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I graphed it and found solutions at
x = 21.35.. and x = -30.35..
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graph%28400%2C400%2C-40%2C40%2C-50%2C50%2Cx%5E2%2B9x-648%29
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Cheers,
Stan H.

Answer by Maths68(1474) About Me  (Show Source):