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Q.

What will be the square of 49?

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a

2401

b

4949

c

2409

d

3201

answer is A.

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Detailed Solution

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We can find the square of 49 as follows:

492 = (40 + 9)2

= 40(40 + 9) + 9(40 + 9)

= 402 + 40 × 9 + 9 × 40 + 92

= 1600 + 360 + 360 + 81 

= 2401

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