Which expression is equivalent to $6x(x+3)$? | Ronan SAT

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Question

Prompt

Which expression is equivalent to

6 x (x + 3)

?

6 x^{2} + 3

A

6 x^{2} + 18 x

B

7 x^{2} + 3

C

7 x^{2} + 9 x

D