find the value of (5a+3b)
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5a+3b
Cubing, we get
=(5a+3b)
3
We know,
(a+b)
3
=a
3
+b
3
+3a
2
b+3ab
2
Thus,
(5a+3b)
3
=(5a)
3
+(3b)
3
+3(5a)
2
(3b)+3(5a)(3b)
2
=125a
3
+27b
3
+225a
2
b+135ab
2
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