a3 + b3 = কত?
A
a3+b3+3a2b+3ab2
B
a+b3-3ab a+b
C
a+b3+3ab a+b
D
a-b3-3ab a-b
Correct Answer: a+b3-3ab a+b
We know, (a+b)3=a3+b3+3a2b+3ab2=a3+b3+3ab(a+b)Therefore, a3+b3=(a+b)3-3ab(a+b)