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Which option gives the correct simplified form of (7ab-4a+3ab+9a)?

Answer and explanation

Correct answer: \(10ab+5a\)

Combine like terms: \(7ab+3ab=10ab\) and \(-4a+9a=5a\). Hence, the simplified expression is \(10ab+5a\). The terms \(ab\) and \(a\) are unlike terms, so they cannot be combined. Exam tip: Add or subtract coefficients only when the variable parts of the terms are exactly the same.

Related tags

Algebraic ExpressionsLike TermsSimplificationPolynomialsGrade 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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