1.

If (57)2 is added to the square of a number, the answer so obtained is 8010. What is the number? (a) 61 (b) 63 (c) 67 (d) 59 (e) None of these

Answer»

(e) Let the number be = x
According to the question,
x2 + 572 = 8010
or, x2 + 3249 = 8010
or, x2 = 8010 – 3249 = 4761
or, x = 4761 = 69



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