3 years ago

The product of a number and 9 less than the number is 90. Find the number.

1 answer:

7 0

Let's say this number is a:
a*(a-9) = 90
a^2-9a-90 = 0
(a-15)(a+6) = 0
a = 15 or a = -6
Therefor a. would be the correct answer :)

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