SOLUTION: The square of a number is 20 more than 8 times the number. Find the number.

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: The square of a number is 20 more than 8 times the number. Find the number.      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 275033: The square of a number is 20 more than 8 times the number. Find the number.
Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
Let's have x represent the number. Therefore the equation will be:
x^2=8x+20 Subtract 8x and 20 from both sides to get:
x^2-8x-20=0 This can be factored into:
(x-10)(x+2)=0 Solve for x:
x=10
x=-2
Check it out to see if the answers work.
Also check out a new book I wrote:
www.math-unlock.com