(3m – 2n2) × (- 7 mn) ………………… A) – 21 m2 n + 14 m

1.	(3m – 2n2) × (- 7 mn) ………………… A) – 21 m2 n + 14 mn3 B) 21 m2 n – 14 m3 C) – 21 mn2 + 14 m3 n D) 21 m2 – 4 mn3
Answer» A) – 21 m² n + 14 mn³ Correct option is (A) –21 m²n + 14 mn³ \((3m-2n^2)\times(-7\,mn)\) \(=3m\times-7mn-2n^2\times-7mn\) \(=(3\times-7)m^2n+(-2\times-7)mn^3\) = \(–21\,m^2n+14\,mn^3\).

(3m – 2n2) × (- 7 mn) ………………… A) – 21 m2 n + 14 mn3 B) 21 m2 n – 14 m3 C) – 21 mn2 + 14 m3 n D) 21 m2 – 4 mn3

Answer»

A) – 21 m² n + 14 mn³

Correct option is (A) –21 m²n + 14 mn³

\((3m-2n^2)\times(-7\,mn)\) \(=3m\times-7mn-2n^2\times-7mn\)

\(=(3\times-7)m^2n+(-2\times-7)mn^3\)

= \(–21\,m^2n+14\,mn^3\).