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Let the two numbers be 'm' & 'n'

Sum = m + n = -9

Product is mn = -90

Hence

m = -90/n

Substitute

-90/n + n = -9

Multiply through by 'n'

-90 + n^2 = - 9n

n^2 + 9n - 90 = 0

It is now in quadratic form ; factor

(n + 15)(n - 6) = 0

n = -15 & n = 6

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lenpollock

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โˆ™ 2022-10-22 15:04:35
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โˆ™ 2012-09-30 15:55:07

15 and -6

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Q: Two numbers have a sum of -9 and a product of -90 What are the numbers?
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