1.

A man’s age after 15 years will be the square of his age 15 years ago. What is his present age?

Answer»

Let x be the age

x + 15 = (x - 15)2

x + 15 = x2 - 30x + 225

x2 - 31x + 210 = 0

\(x=\frac{31\pm\sqrt{11}}{2}\)

x = 21, 10

∴ age x = 21



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