find the present age
Attachments:
Answers
Answered by
4
Let the present age of Rehman =x
3 years ago Rehman’s age =(x–3) years
5 years later Rehman’s age =(x+5) years.
Now, according to the condition,
(x–3)1+(x+5)1=31
(x–3)(x+5)(x+5+x–3)=31
(x2–3x+5x–15)(2x+2)=31
x2+2x–15=6x+6
x2–4x–21=0
(x+3)(x–7)=0
Either,x+3=0 Or, x–7=0
Thus, x=7 or –3; but age cannot be negative.
Hence the present age of Rehman is 7 years.
Similar questions