Which expression is equivalent to 9 x 2 + 7 x 2 + 9 x ?

Question

Accepted Answer

Choice D is correct. In the given expression, the first two terms, 9 x 2 and 7 x 2 , are like terms. Combining these like terms yields 9 x 2 + 7 x 2 , or 16 x 2 . It follows that the expression 9 x 2 + 7 x 2 + 9 x is equivalent to 16 x 2 + 9 x . Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.

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