64m cube + 125n cube
if 4m + 5n =19 mn = 5
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Answer:
64m³-125n³
(4m)³- (5n)³
a³-b³=(a²+ab+b²)(a-b)
(4m)³- (5n)³= {(4m)²+(4m)(5n)+(5n)²}(4m-5n)
=(16m²+20mn+25n²)(4m-5n)
I hope this will help you
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