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In which option is p(x) − q(x) a linear polynomial?

Answer and explanation

Correct answer: p(x) = 2x + 3, q(x) = x − 5

The governing concept is determining the degree of the simplified difference of two polynomials. A linear polynomial must have degree exactly 1, meaning that after subtraction a nonzero x-term must remain. In option B, p(x) − q(x) = (2x + 3) − (x − 5) = 2x + 3 − x + 5 = x + 8, which has degree 1. Therefore, option B is correct. In option A, the x-terms cancel and the result is 3, a constant. In option C, the two identical polynomials subtract to give 0. In option D, 5 − 2 = 3, also a constant. Thus the other options do not produce a linear polynomial after simplification.

Related tags

Linear PolynomialsDegreePolynomial SubtractionClass 9Introduction To PolynomialsMathematicsClass 9 Mcq

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