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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