book Maths Puzzle Numerical Ability

The square of 9 more than a number is equal to 9 more than the square of the number. What is the number?
thanx

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book Other Question

you have budgeted 450$ for carpeting. if you need 30 square yards of carpeting, how much can you spend per square yard? THIS IS THE EQUATION
12X-X=15180
I AM NOT IN SCHOOL AND JUST NEED SOME HELP WITH THIS
THANKS,
JOHN