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For which polynomial is x = −3 a zero?

Answer and explanation

Correct answer: p(x) = x + 3

The governing concept is the definition of a zero of a polynomial. A number a is a zero of p(x) exactly when p(a) = 0. Substitute x = −3 into each option. For A, p(−3) = −3 + 3 = 0, so −3 is a zero of x + 3. For B, the value is −3 − 3 = −6. For C, it is 3(−3) + 1 = −9 + 1 = −8. For D, it is (−3)^2 + 3 = 9 + 3 = 12. Since only option A produces zero, A is correct. The plus sign in x + 3 is essential: it cancels the negative input. Direct substitution is more reliable than choosing by visual appearance alone.

Related tags

PolynomialsZero-Of-PolynomialEvaluationLinear-PolynomialPolynomials In One VariableMathematicsClass 10 Mcq

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