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What is the simplified form of (5a-2[3a-4(a-2)])?

Answer and explanation

Correct answer: \(7a-16\)

First simplify inside the square bracket: \(3a-4(a-2)=3a-4a+8=-a+8\). Then \(5a-2[-a+8]=5a+2a-16=7a-16\). Therefore, the correct answer is \(7a-16\). The expression \(7a+16\) results from incorrectly handling the sign of \(+8\) when multiplying by \(-2\). Exam tip: When a negative coefficient is outside brackets, distribute it to every term carefully.

Related tags

Algebraic ExpressionsBracket SimplificationDistributive PropertyLinear ExpressionsPolynomialsIntroduction To PolynomialsMathematicsClass 9 Mcq

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