Q. 223.6( 10 Votes )

Simplify (2a + b

Answer :

We have (2a + b)3 + (2a - b)3


We know,

(a+b)³=a³+3a²b+3ab²+b³ 
 (a-b)³=a³-3a²b+3ab²-b³

So,
= (8a3 + 12a2b + 3ab2 + b3)+(8a3 - 12a2b + 3ab2 - b3)
                             = 16a3 + 6ab2

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