Question

Expand (x - 2)³.

Answer 1

(a - b)³ = a³ - 3a²b + 3ab² - b³

Here taking, a = x and b = 2,

`(x - 2)^3 = x^3 - 3 xx x^2 xx 2 + 3 xx x xx (2)^2 - (2)^3`

`(x - 2)^3 = x^3 - 6x^2 + 12x - 8`