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What is obtained after simplifying (4x^2-5xy+2y^2-(x^2+3xy-6y^2))?

Answer and explanation

Correct answer: \(3x^2-8xy+8y^2\)

A minus sign before the second bracket changes the sign of every term inside it: \(4x^2-5xy+2y^2-x^2-3xy+6y^2\). Combining like terms gives \((4-1)x^2+(-5-3)xy+(2+6)y^2=3x^2-8xy+8y^2\). Option D results from incorrectly keeping the sign of the \(xy\) term positive. Exam tip: When a bracket is preceded by ‘−’, change every sign inside it before combining like terms.

Related tags

Algebraic ExpressionsPolynomialsSubtraction Of PolynomialsLike TermsBracketsIntroduction To PolynomialsMathematicsClass 9 Mcq

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