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What is obtained by subtracting (3x^2+2x-5) from (9x^2-4x+1)?

Answer and explanation

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

While subtracting the second polynomial, change the sign of each of its terms: \((9x^2-4x+1)-(3x^2+2x-5)=9x^2-4x+1-3x^2-2x+5\). Combining like terms gives \(6x^2-6x+6\). Option A has an incorrect linear term because \(-4x-2x=-6x\). Exam tip: change every sign inside the polynomial being subtracted before removing the brackets.

Related tags

PolynomialsAlgebraic ExpressionsPolynomial SubtractionLike TermsClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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