SAT Mathematics Practice Test 3

The sum of the two polynomials is (3x2−5x+2)+(5x2−2x−6). This can be rewritten by combining like terms:
Choice B is incorrect and may be the result of a sign error when combining the coefficients of the x-term.
Choice C is incorrect and may be the result of adding the exponents, as well as the coefficients, of like terms.
Choice D is incorrect and may be the result of a combination of the errors described in B and C