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What is obtained by subtracting (2x^2+4x-1) from (5x^2-3x+8)?

Answer and explanation

Correct answer: \(3x^2-7x+9\)

To subtract the second polynomial, change the sign of every term in it: \((5x^2-3x+8)-(2x^2+4x-1)=5x^2-3x+8-2x^2-4x+1\). Combining like terms gives \(3x^2-7x+9\). Hence, option B is correct. Option C results from an incorrect sign while subtracting \(4x\). Exam tip: a minus sign before brackets changes the sign of every term inside them.

Related tags

PolynomialsAlgebraic ExpressionsPolynomial SubtractionLike TermsClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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