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Question
Simplify:
(3a + 5b)3 − (3a − 5b)3
Simplify
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Solution
It is known that,
a3 − b3 = (a − b)(a2 + ab + b2)
(3a + 5b)3 − (3a − 5b)3
= {(3a + 5b) − (3a − 5b)}{(3a + 5b)2 + (3a + 5b)(3a − 5b) + (3a − 5b)2}
= 10b(9a2 + 25b2 + 30ab + 9a2 + 25b2 − 30ab + 9a2 − 25b2)
= 10b (27a2 + 25b2)
= 10b × 27a2 + 10b × 25b2
= 270a2b + 250b3
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