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Syllabus

Expand: (51)2 -

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Question

Expand: (51)2

Sum

Solution

(51)2

= (50 + 1)2

= 502 + 2 x 50 x 1 + 1 x 1

= 2500 + 100 + 1

= 2601.

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Expansion of (a + b)2 = a2 + 2ab + b2
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