SOLUTION: If the square of a positive integer is added to 4 times the integer, the result is 45. Find the integer.

Algebra ->  Problems-with-consecutive-odd-even-integers -> SOLUTION: If the square of a positive integer is added to 4 times the integer, the result is 45. Find the integer.       Log On


   

Question 914567: If the square of a positive integer is added to 4 times the integer, the result is 45. Find the integer.
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
x^2 + 4x = 45
x^2 + 4x - 45 = 0
(x + 9)(x - 5) = 0

The integer is positive, so x = 5.