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What is obtained by subtracting (2a^2+5ab-b^2) from (5a^2-2ab+3b^2)?

Answer and explanation

Correct answer: \(3a^2-7ab+4b^2\)

To subtract the second polynomial, change the sign of each of its terms: \((5a^2-2ab+3b^2)-(2a^2+5ab-b^2)=5a^2-2ab+3b^2-2a^2-5ab+b^2\). Combining like terms gives \(3a^2-7ab+4b^2\). In option B, the sign of the \(ab\) term is incorrect. Exam tip: when a minus sign comes before brackets, reverse the signs of every term inside the brackets.

Related tags

PolynomialsAlgebraic ExpressionsPolynomial SubtractionLike TermsGrade 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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