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If \(r(x)=2x^2-x+4\) is subtracted from \(p(x)=5x^2+3x-2\), which polynomial is obtained?

Answer and explanation

Correct answer: \(3x^2+4x-6\)

We need to find \(p(x)-r(x)\): \((5x^2+3x-2)-(2x^2-x+4)\). The minus sign changes the sign of every term in the second polynomial, giving \(5x^2-2x^2=3x^2\), \(3x-(-x)=4x\), and \(-2-4=-6\). Therefore, the result is \(3x^2+4x-6\). Exam tip: when subtracting a polynomial, distribute the minus sign to every term inside the second bracket before combining like terms.

Related tags

Polynomial SubtractionLike TermsPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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