alishakhan3
Let his present age b x yrs.. Then his age, 5 yrs ago =(x-5)yrs His age 7 years hence =(x+7)yrs Acc. to question, (x-5)(x+7)=28 =>x2+2x-63=0 =>x2+9x-7x-63=0 =>x(x+9)-7(x+9)=0 =>x=-9,7... Negative can't b the answer. Therefore answer is 7 yrs
Answers & Comments
Then his age, 5 yrs ago =(x-5)yrs
His age 7 years hence =(x+7)yrs
Acc. to question,
(x-5)(x+7)=28
=>x2+2x-63=0
=>x2+9x-7x-63=0
=>x(x+9)-7(x+9)=0
=>x=-9,7...
Negative can't b the answer. Therefore answer is 7 yrs