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

Answer and explanation

Correct answer: -4a-30

First simplify the square bracket: 4a-2(a-5)=4a-2a+10=2a+10. Now, 2a-3(2a+10)=2a-6a-30=-4a-30. Therefore, -4a-30 is correct. In -4a+30, the sign of the constant term is incorrect because multiplying -3 by +10 gives -30. Exam tip: When a negative coefficient is outside brackets, multiply it by every term inside the bracket.

Related tags

Algebraic ExpressionsPolynomialsBracket SimplificationDistributive PropertyClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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