Question which-
Which of the following is equivalent to the given expression?
Which of the following is equivalent to the given expression?
Hard-difficulty · SAT Math · Equivalent Expressions — Simplifying polynomials. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice C is correct. Distributing the negative sign to the terms in the second parentheses yields 
. This expression can be rewritten as 
. Combining like terms results in .
Choice A is incorrect and may result from not distributing the negative sign to the 7. Choice B is incorrect and may result from adding 
to 
instead of subtracting . Choice D is incorrect and may result from adding the product of 
and x to the product of 3 and 7.
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