( a + b ) ( a2 - ab + b2 ) = ? 

A a2 - b2 

B a3 + b3

C a6 - b6

D a6 + b6

Solution

Correct Answer: Option B

দেয়া আছে, ( a + b ) ( a2 -ab + b2

= a ( a2 -ab + b2 ) +b ( a2 -ab + b2

= a3 - a2b + ab2 + a2b - ab2 + b3 

= a3 - a2b + a2b + ab2 - ab2 + b3 

= a3 + b3 

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