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Question
Expand.
(7 + m)3
Sum
Solution
(7 + m)3
= (7)3 + 3 × (7)2 × (m) + 3 × (7) × (m)2 + (m)3 …[∵ (a + b)3 = a3 + 3a2b + 3ab2 + b3]
= 343 + 3(49)(m) + 3(7)(m2) + m3
= 343 + 147m + 21m2 + m3
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