Which expression is equivalent to \((3nr^2 + 6nr) + (4n^2r + 2nr)\)? | Ronan SAT

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Question

Prompt

Which expression is equivalent to

(3 n r^{2} + 6 n r) + (4 n^{2} r + 2 n r)

?

7 n^{2} r^{2} + 8 n r

A

7 n^{3} r^{3} + 8 n^{2} r^{2}

B

12 n^{3} r^{3} + 12 n^{2} r^{2}

C

3 n r^{2} + 4 n^{2} r + 8 n r

D