SOLUTION: if the square of a number is decreased by 15, the result is equal to the number increased by 15. what is the number?

Question 372543: if the square of a number is decreased by 15, the result is equal to the number increased by 15. what is the number?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Let n = the number.
"...the square of a number (n) is decreased by 15, the result is equal to the number increased by 15."
Add 15 to both sides.
Subtract n from both sides.
Subtract 30 from both sides.
Solve this quadratic equation by factoring.

or
As you can see, there are two answers:
-5 and 6
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