math
posted by jarron .
Find a pair of integers with a product of 84 and a sum of 5?

Eq1: x*y = 84
Eq2: x+y = 5
x+y = 5
y = 5x
In Eq1, replace y with 5x:
x*(5x) = 84
5xx^2 = 84
x^2+5x+84 = 0
Use Quadratic Formula and get:
X = 7, and 12.