Find the coefficient  of x2 in (2x + y)3

12y2  12x2  6y 12y

12y

(2x + y)3 = 8x3 + y3 + 6xy (2x + y)                = 8x3 + y3 + 12yx2 + 6xy2 ⇒ Coefficient  of x2 = 12y