SOLUTION: 15 more than the square of a number is 8 times the number

Algebra ->  Customizable Word Problem Solvers  -> Numbers -> SOLUTION: 15 more than the square of a number is 8 times the number      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 176685: 15 more than the square of a number is 8 times the number
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
Although you don't specifically say, I assume that you want to determine the number.

The number: x

The square of the number: x%5E2

15 more than the square of the number: x%5E2+%2B+15

8 times the number: 8x

15 more than the square of the number is (=) 8 times the number: x%5E2+%2B+15+=+8x

Put the quadratic into standard form and solve by factoring:

x%5E2+-8x+%2B+15+=+0

Hint: -3 + (-5) = -8 and -3 X -5 = 15