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What is the simplified form of \(12a+9a\)?

Answer and explanation

Correct answer: \(21a\)

\(12a\) and \(9a\) are like terms, so their coefficients are added: \((12+9)a=21a\). The exponent of \(a\) does not change, so \(21a^2\) is incorrect. Exam tip: For like terms, add or subtract only the coefficients while keeping the variable part unchanged.

Related tags

PolynomialsLike TermsAddition Of Algebraic ExpressionsLaws Of ExponentsOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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