SOLUTION: The square of 9 more than a number is equal to 9 more than the square of the number. What is the number?
i tried but couldn't find the answer :(
thought was nine at first so
Algebra.Com
Question 818379: The square of 9 more than a number is equal to 9 more than the square of the number. What is the number?
i tried but couldn't find the answer :(
thought was nine at first so i tried ( i'm home schooled and it tells you if your wrong or right on practice test )
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
(n+9)^2=n^2+9
n^2+18n+81=n^2+9
18 n+72 = 0
n=-4
check
25=25
ok
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