Posted by **fred** on Wednesday, May 19, 2010 at 11:10pm.

pierre was born in the twentieth century and will be x years old in the year x squared. In what year was pierre born

- math -
**drwls**, Thursday, May 20, 2010 at 4:27am
Let y be the year of his birth. x^2 is the year when he is x years old.

x^2 - y = x

x^2 -x = y must be between 1900 and 2000

Try x = 45. His birth year would be 1980

If x = 46, his birth year would be 2070 (too late)

If x = 44, his birth year would be 1892 (too early).

So the birth year is 1980

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