1.

If \[y={{x}^{2}}{{e}^{mx}}\], where m is a constant, then \[\frac{{{d}^{3}}y}{d{{x}^{3}}}=\] [MP PET 1987]

A.            \[m{{e}^{mx}}({{m}^{2}}{{x}^{2}}+6mx+6)\]
B.            \[2{{m}^{3}}x{{e}^{mx}}\]
C.            \[m{{e}^{mx}}({{m}^{2}}{{x}^{2}}+2mx+2)\]
D.            None of these
Answer» B.            \[2{{m}^{3}}x{{e}^{mx}}\]


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