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Question
Expand the following:
(−2a − 5b)2
Sum
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Solution
(−2a − 5b)2
Let’s treat [(−2a − 5b)2] as (2a + 5b)2
Then, here a = 2a, b = 5b
Thus,
(2a + 5b)2 = (2a)2 + 2(2a)(5b) + (5b)2
4a2 + 2(10ab) + 25b2
∴ 4a2 + 20ab + 25b2
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