Question

the present age of two elder and younger brother is 13 and 7 years respectively.In how many years will be the product of their age be 280? find it

Answer 1

Step-by-step explanation:

let the years be x

(13+x)(7+x)=280

91+20x+x^2=280

x^2+20x-189=0

from quadratic formula

x=7 or -26

years cannot be in negative

after 7 years product of their age is equat to 280