SOLUTION: The square of a number is equal to ninety more than the number. Find all such numbers.

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Question 1171611: The square of a number is equal to ninety more than the number. Find all such numbers.
Answer by ikleyn(52798) About Me  (Show Source):
You can put this solution on YOUR website!
.

The problem says that

    n^2 = n + 90


Simplify and solve

    n^2 - n - 90 = 0

    (n-10)*(n+9) = 0.


There are two answers:  n= 10  (positive)  and  n= -9 (negative).


Both satisfy the problem's description.

Solved.