Simplify : $(- 3 p q^{2} + 4 p q) - (7 p q - 9 p q^{2}) .$

6 p q^{2} + 3 p q

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6 p q^{2} - 3 p q

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- 12 p q^{2} + 3 p q

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- 12 p q^{2} - 3 p q

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Solution

The correct option is B $6 p q^{2} - 3 p q$
$(- 3 p q^{2} + 4 p q) - (7 p q - 9 p q^{2})$ $= (- 3 p q^{2} + 4 p q - 7 p q + 9 p q^{2})$
$= (6 p q^{2} - 3 p q)$

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