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Which calculation correctly proves that p(-3)=0 for the polynomial p(x)=x^3+27?

Answer and explanation

Correct answer: p(-3)=(-3)^3+27=-27+27=0

Substituting -3 for x gives p(-3)=(-3)^3+27=-27+27=0. Therefore, -3 is a zero of the polynomial. Option C is incorrect because it ignores the negative sign; for an odd power, (-3)^3=-27, not 27. Exam tip: To verify a zero, substitute the given value directly into the polynomial and check whether the result is 0.

Related tags

PolynomialsZero Of PolynomialSubstitutionCubic PolynomialPolynomials In One VariableMathematicsClass 10 Mcq

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