Question

Expand the following

Step by step solution please

will surely mark the right answer as brainlist ​

Answer 1

Answer:

lUsing identity: (a + b)³ = a³+ b³+ 3ab(a + b)

(2x + 1)³ = (2x)³ + 1³ + (3×2x×1)(2x + 1)

= 8x³+ 1 + 6x(2x + 1)

= 8x³ + 1 + 12x² + 6x

Answer 2

$(2x - 1)^3\\\\= (2x - 1) (2x - 1) (2x - 1)\\\\= (4x^2 - 2x - 2x + 1) (2x - 1)\\\\= (4x^2 - 4x + 1) (2x - 1) \\\\= 8x^3 - 4x^2 - 8x^2 + 4x + 2x - 1\\\\= 8x^3 - 12x^2 + 6x - 1$