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Advanced Math / Equivalent expressions Difficulty: Easy

Which expression is equivalent to $9 x^{2} + 7 x^{2} + 9 x$ ?

$63 x Superscript 4 plus 9 x$

$9 x squared plus 16 x$

$25 x Superscript 5$

$16 x squared plus 9 x$

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Explanation

Choice D is correct. In the given expression, the first two terms, $9 x squared$ and $7 x squared$ , are like terms. Combining these like terms yields $9 x squared plus 7 x squared$ , or $16 x squared$ . It follows that the expression $9 x^{2} + 7 x^{2} + 9 x$ is equivalent to $16 x squared plus 9 x$ .

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.