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

Answer and explanation

Correct answer: \(3x+6\)

First simplify the innermost grouping: \(3x-\{x-4\}=3x-x+4=2x+4\). Then \(5(x+2)-[2x+4]=5x+10-2x-4=3x+6\). Therefore, the correct option is \(3x+6\). The result \(3x+14\) can occur if the minus sign before the bracket is not distributed correctly. Exam tip: when removing a bracket preceded by a minus sign, change the signs of all terms inside it.

Related tags

Algebraic ExpressionsPolynomialsBracketsSimplificationSign RulesGrade 9Introduction To PolynomialsMathematics

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