Which expression is equivalent to \(3xy(2x^2 + 7y)\)? | Ronan SAT

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Question

Prompt

Which expression is equivalent to

3 x y (2 x^{2} + 7 y)

?

5 x^{3} y + 10 x y^{2}

A

6 x^{2} y + 7 y

B

6 x^{2} y + 21 x y

C

6 x^{3} y + 21 x y^{2}

D