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If (f(x)=x^2-1) and (g(x)=x^3+f(x)), what is the degree of (g(x))?

Answer and explanation

Correct answer: 3

Given \(f(x)=x^2-1\), we get \(g(x)=x^3+f(x)=x^3+x^2-1\). The highest power of \(x\) in this polynomial is 3, so the degree of \(g(x)\) is 3. Degree 2 is the degree of \(f(x)\), not of \(g(x)\). Exam tip: Substitute first, simplify the polynomial, and then identify the highest power of \(x\).

Related tags

PolynomialsDegree Of PolynomialFunction NotationSubstitutionAlgebraDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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