If and what is in terms of x?
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Choice C is correct. Substituting the expressions equivalent to y and z into results in the expression The student must apply the distributive property to multiply by 2 and then combine the like terms in the expression.
Choice A is not the correct answer. This answer may result if a student correctly finds 2y in terms of x but does not pay careful attention to exponents when adding to and then combines the and terms.
Choice B is not the correct answer. This answer may result if a student fails to distribute the 2 when multiplying
Choice D is not the correct answer. This answer may result from a student finding instead of
Students must substitute polynomials into an expression and then simplify the resulting expression by combining like terms.