Find A Positive Number Is 30 Less Than Its Square.?

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Oddman answered
An equation for your number (x) can be written ...
x = x2 - 30
x2 - x - 30 = 0    (arranged in standard form)
(x-6)(x+5) = 0    (factored)
x = 6  or  x = -5

A positive number 30 less than its square is 6, which is 30 less than 36.

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