Answer :
We know that,
a3 + b3 = (a + b) (a2 – a × b + b2)
Using this formula, we get
= (5a)3 + (
)3
= (5a + 
) [ (5a)2 – 5a × 
+ (
)2]
= (5a + 
) (25a2 - 
+ 
)
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