Question

find the cube of 2a - 1​

Answer 1

Step-by-step explanation:

${(2a - 1)}^{3}$

By using the identity,

(a - b)³ = a³ - b³ - 3ab(a - b)

${(2a)}^{3} - {(1)}^{3} - 3(2a)(3)(2a - 1)$

$= 8 {a}^{3} - 1 - 18a(2a - 1)$

$= 8 {a}^{3} - 1 - 36 {a}^{2} + 18a$

$= 8 {a}^{3} - 36 {a}^{2} + 18a - 1$

Answer 2

Answer:

8a³ - 36a² + 18a -1

Step-by-step explanation:

hope it will help you...