x 3 – x = x(x 2 – 1) (taking x as common from whole) = x(x – 1)(x + 1) a 2 – b 2 = (a – b)(a + b)

x 3 – x =?

x³ – x = x(x² – 1) (taking x as common from whole)

= x(x – 1)(x + 1) a² – b² = (a – b)(a + b)