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Question

The value of (107)2 - (93)2 is: ____.

A
1382
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B
36482
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C
1008
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D
2800
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Solution

The correct option is D 2800
(107)2 can be written as (100+7)2 and (93)2 can be written as (100-7)2.
1072932=(100+7)2(1007)2.
This is in the form of (a+b)2(ab)2 where a = 100 and b=7

We know that, (a+b)2=a2+2ab+b2 and (ab)2=a22ab+b2
(a+b)2(ab)2=a2+2ab+b2a22ab+b2=4ab
1072932=4ab=4×100×7=2800

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