Solution
$$(2x + y)^3$$
= $$(2x)^3 + y^3 + 3.2x.y(2x + y)$$
($$\because (a + b)^3 = a^3 + b^3 + 3ab(a + b)$$)
= $$8x^3 + y^3 + 6xy(2x + y)$$
= $$8x^3 + y^3 + 12x^2y + 6xy^2$$
The coefficient of $$x^2$$ = 12y
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