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1 . Square of a number plus two times the number equal 63. What is the number ?

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Answer: Option D

Explanation:

Let the number be x.

Then, x^2 + 2x = 63 [according to the question]

or, x^2 + 2x - 63 = 0

or, x^2 + 9x - 7x - 63 = 0

or, (x + 9) (x - 7) = 0

Therefore, x = 7 or - 9.

Bangladesh Bank - Assistant Director - 2011