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What is the remainder when the polynomial \(p(x)=3x^3-2x^2+x+7\) is divided by \(x+2\)?

Answer and explanation

Correct answer: -27

By the Remainder Theorem, the remainder when \(p(x)\) is divided by \(x-a\) is \(p(a)\). Since \(x+2=x-(-2)\), substitute \(x=-2\): \(p(-2)=3(-2)^3-2(-2)^2+(-2)+7=-24-8-2+7=-27\). Therefore, option A is correct. Exam tip: Rewrite the divisor as \(x-a\) before substituting, so the sign of \(a\) is not missed.

Related tags

PolynomialsRemainder TheoremPolynomials In One VariableSubstitutionGrade 10MathematicsClass 10 Mcq

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