Question

find using suitable identity
(a) (2x + 1)^3​

Answer 1

Answer:

(a+b)3= a3 +b3+3ab(a+b)...

use this identity..ok

Answer 2

Question:

To Simplify: (2x+1)³

Solution:

[∵ (a+b)³=a³+b³+3a²b+3ab²]

Therefore,

(2x+1)³=(2x)³+(1)³+3(2x)²(1)+3(2x)(1)²

=8x³+1+12x²+6x , or:

(2x+1)³=8x³+12x²+6x+1