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Advanced Math / Equivalent expressions Difficulty: Easy

Which expression is equivalent to $23 x^{3} + 2 x^{2} + 9 x$ ?

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Explanation

Choice C is correct. Since $x$ is a common factor of each term in the given expression, the given expression can be rewritten as $x (23 x^{2} + 2 x + 9)$ .

Choice A is incorrect. This expression is equivalent to $23 x^{3} + 46 x^{2} + 207 x$ .

Choice B is incorrect. This expression is equivalent to $207 x^{4} + 18 x^{3} + 9 x$ .

Choice D is incorrect. This expression is equivalent to $34 x^{3} + 34 x^{2} + 34 x$ .