Factorise (3a+5b)³- (a-2b)³ step by step
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Answer:
Step-by-step explanation:
(3a+5b)³-(a-3b)³
={(3a+5b)-(a-3b)}{(3a+5b)²+(a-3b)²+(3a+5b)(a-3b)}
=(3a+5b-a+3b)(9a²+25b²+30ab+a²+9b²-6ab+3a²-9ab+5ab-15b²)
=(2a+8b)(13a²+19b²+20ab)
=2(a+4b)(13a²+19b²+20ab).(answer)
Hope you got it.
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