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Two numbers have a sum of -9 and a product of -90 What are the numbers?
Wiki User
∙ 11y ago
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
lenpollock
Wiki User
∙ 11y ago15 and -6
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