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Which option gives the correct result of subtracting (x+5y) from (4x-2y)?

Answer and explanation

Correct answer: \(3x-7y\)

The subtraction is \((4x-2y)-(x+5y)\). The minus sign before the second bracket changes the signs of both its terms: \(4x-2y-x-5y\). Combining like terms gives \(4x-x=3x\) and \(-2y-5y=-7y\), so the result is \(3x-7y\). In \(5x-7y\), the \(x\)-terms have been incorrectly added. Exam tip: when a bracket is preceded by a minus sign, change the sign of every term inside it.

Related tags

Algebraic ExpressionsPolynomial SubtractionLike TermsSign RulesLinear ExpressionsIntroduction To PolynomialsMathematicsClass 9 Mcq

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