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Syllabus

Expand: 102 x 98 -

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Question

Expand: 102 x 98

Sum

Solution

102 x 98

= (100 + 2)(100 - 2)

= (100)2 - (2)2

= 10000 - 4

= 9996.

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Expansion of (a + b)(a - b) = a2-b2
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