English
Syllabus

Simplify. (p + q)3 + (p - q)3 -

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Question

Simplify.

(p + q)3 + (p - q)3

Sum

Solution

(p + q)3 + (p - q)3

= p3 + 3p2q + 3pq2 + q3 + p3 - 3p2q + 3pq2 - q3

= 2p3 + 6pq2

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Expansion of (a - b)3
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