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11-04-2018
Mathematics

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

Select one:
a. -6 or 15
b. -15 or 6
c. -16 or 5
d. -5 or 16

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Аноним Аноним

11-04-2018

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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