2x children will get 6xy+4xy2 chocolates.
So, 1 child will get 6xy+4x(y2)2x chocolates.
Factorize 6xy+4xy2 by using method of common factors.
2×3×x×y+2×2×x×y×y=2x(3y+2y2)
So 6xy+4x(y2)2x = 2x(3y+2y2)2x = (3y+2y2)
Given y = 2. Substituting the value of y in (3y+2y2)
3×2+2×2×2=6+8=14