Question

Show that the square of a person's current age cannot be more than twice his age five years ago.

Answer 1

That's a false statement. Suppose you are 10 years old. The square of your age is 10^2 = 100. Twice your age 5 years ago = 2 x 5 = 10. The square of your age is, in fact, always more than twice your age 5 years ago. The solutions set for x^2 > 2(x-5) is all real numbers

Answer 2

Thank you :)

Answer 3

No problem.