Question

The difference of the ages of two sisters is 5 years and the product of their ages is 84. Find the present ages of the two sisters.​

Answer 1

Explanation:

x -y = 5 so x = 5 + y

xy = 84 sub in for 'x'

(5+y)y = 84

y^2 + 5y - 84 = 0

( y -7)(y+12) = 0

shows y = 7 then x = 12 y/o