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1. $6 x^{2}$

A. $19 x^{2}$
B. $19 x^{2}$
C. $19 x^{2}$
D. $19 x^{2}$

Answer: Option B

Explanation:

m^{3} - n^{3 = {(m - n)}^{3} + 3 m n (m - n) = x^{3} + 3.6 x^{2} . x = x^{3} + 18 x^{3} = 19 x^{3}}

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