Question

The product of age of ramu 5 years ago and his age 9 years later is 15 . Determine present age of ramu

Answer 1

LET RAMU S AGE BE X

(X-5)(X+9)=15

X*X+9X-5X-45=15

X*X+4X-60=0

X^2+10X-6X-60=0

BY QUADRATIC EQUATION WE GET;

X(X+10)-6(X+10)=0

(X+10)(X-6)=0

THEREFORE X=10,X= -6

SINCE AGE CANT BE NEGATIVE

RAMUS AGE IS 6 YEARS