Question

a mans age after 15 years will be square of his age 15 years ago.what is his present age​

Answer 1

Answer:

21 years old

Step-by-step explanation:

Let the man’s present age = x.

x+15 = (x-15)^2, or

x+15 = x^2–30x+225, or

x^2–31x+210 = 0

(x-21)(x-10) = 0

x = 21 or 10. Here 10 has no relevance.

So the man is 21 years now,