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Eight times the square of a positive integer divided by two equals 144 minus 36 times the positive integer. Find the unknown positive integer.

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The correct answer for the question that is being presented above is this one: "The unknown positive integers are 3 and -12."

Eight times the square of a positive integer divided by two equals 144 minus 36 times the positive integer.

8 * x^2 / 2 = 144 - 36x
4*x^2 = 144 - 36 x
x^2 = 36 - 9x
x^2 + 9x - 36 = 0
(x - 3) (x + 12) = 0

x - 3 = 0
x = 3

x + 12 = 0
x = -12
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