Question

Q1. Sam is 8 years older than his sister. If the product of their ages is 105, how old is Sam?
with formula​

Answer 1

Answer:

Sam’s age =X ===> his sister’s age =X-8

then X*(X-8)=105

X*2–8X=105 ===> X*2–8X-105=0

(X-15)(X+7) =0 then

X=15 years Sam’s age