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Which is the correct simplified form of (3x-[4x-{2x-5}])?

Answer and explanation

Correct answer: \(x-5\)

First simplify the innermost grouped expression: \(4x-\{2x-5\}=4x-2x+5=2x+5\). Now, \(3x-[2x+5]=3x-2x-5=x-5\). Therefore, the correct answer is \(x-5\). The result \(x+5\) comes from not distributing the outer minus sign correctly to both terms inside the bracket. Exam tip: when a bracket is preceded by a minus sign, change the signs of all terms inside it while opening the bracket.

Related tags

Algebraic ExpressionsSimplificationBracketsSign RulesPolynomialsIntroduction To PolynomialsMathematicsClass 9 Mcq

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