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Question
Expand the following:
(2a3 + 5b2)2
Sum
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Solution
(2a3 + 5b2)2
Here, a = 2a3, b = 5b2
Thus,
(2a3 + 5b2)2 = (2a3)2 + 2(2a3)(5b2) + (5b2)2 ...[Using (a ± b)2 = a2 ± 2ab + b2]
4a6 + 2(10a3b2) + 25b4
∴ 4a6 + 20a3b2 + 25b4
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