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For the polynomial \(p(x)=x^4-10x^2+9\), what is the value of \(p(-3)\)?

Answer and explanation

Correct answer: 0

Substituting \(x=-3\), we get \(p(-3)=(-3)^4-10(-3)^2+9=81-90+9=0\). Since the powers are even, \((-3)^4=81\) and \((-3)^2=9\). Option B may result from omitting the middle term \(-10(-3)^2\). In an exam, evaluate the powers first, then perform multiplication and addition or subtraction.

Related tags

Polynomial EvaluationEven PowersSubstitutionPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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