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Question

Find the coefficient of xy2 in the following expression:
x(x+7y2)+y(2x2y+3xyx)+xy(9xy6y)

A
-3
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B
4
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C
-4
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D
3
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Solution

The correct option is B 4
x(x+7y2)+y(2x2y+3xyx)+xy(9xy6y)

x2+7xy2+2x2y2+3xy2xy+9x2y26xy2

11x2y2+4xy2xyx2

Coefficient of xy2 is 4.

The correct option is B.

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