Question

the difference of the ages of 2 sisters is 5 years. After 4 years, if the product of their ages become 104, find their present age

Answer 1

Step-by-step explanation:

let the ages be x and y

x-y=5

x=5+y

(x+4)(y+4)=104

(5+y+4)(y-4)=104

(9+y)(y-4)=104

9y-4y+y²-36=104

5y+y²-36-104=0

y²+5y-140=0