23-04-2020
Mathematics

contestada

The product of a number and 9 less than the number is 22. Find the number.
The number is
(Use a comma to separate answers as needed.)

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23-04-2020

n(n-9) = 22

n^2-9n = 22
n^2-9n-22= 0
find 2 numbers that add to -9 that multiply to -22
(n-11)(n+2)
n-11=0, n+2=0
n=11, n=-2

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