a^3-2a^b+3ab^2+4b from a^3-a^2b-ab^3-b^3
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Step-by-step explanation:
(a+b)
3
=(a+b)
2
(a+b)
=(a
2
+2ab+b
2
)(a+b)
=a
3
+2a
2
b+ab
2
+a
2
b+2ab
2
+b
3
=a
3
+3a
2
b+3ab
2
+b
3
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