Which expression is equivalent to 9x^3 +5x+7 + 6x^3 +5x^2 −5 () ()?
Correct answer: D (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice D is correct. The given expression can be rewritten as 9 3+6 3 +5 2+5 + 7-5 ^ x x h x x ^ h. Combining like terms in this expression yields 15 3+5 2+5 +2 x x 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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