Which expression is equal to (2a-3b+5a-b)?
Answer and explanation
Correct answer: \(7a-4b\)
Combine like terms in the expression: \(2a+5a=7a\) and \(-3b-b=-4b\). Therefore, \(2a-3b+5a-b=7a-4b\), so option B is correct. In option A, the \(b\)-terms have been combined incorrectly, while option D wrongly multiplies \(a\) and \(b\). Exam tip: Add or subtract only terms with the same variable and the same power.
Frequently asked questions
What is the correct answer to this question?
\(7a-4b\)
Why is this the correct answer?
Combine like terms in the expression: \(2a+5a=7a\) and \(-3b-b=-4b\). Therefore, \(2a-3b+5a-b=7a-4b\), so option B is correct. In option A, the \(b\)-terms have been combined incorrectly, while option D wrongly multiplies \(a\) and \(b\). Exam tip: Add or subtract only terms with the same variable and the same power.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Algebraic expressions.
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