Which expression represents the sum of twice (r) and three times (s)?
Answer and explanation
Correct answer: \(2r+3s\)
Twice \(r\) is \(2r\), and three times \(s\) is \(3s\). Adding them gives \(2r+3s\), so option A is correct. In \(3r+2s\), the coefficients are interchanged, while expanding \(2(r+3s)\) gives \(2r+6s\). Exam tip: Write the stated multiple with each variable first, then use \(+\) for “sum.”
Frequently asked questions
What is the correct answer to this question?
\(2r+3s\)
Why is this the correct answer?
Twice \(r\) is \(2r\), and three times \(s\) is \(3s\). Adding them gives \(2r+3s\), so option A is correct. In \(3r+2s\), the coefficients are interchanged, while expanding \(2(r+3s)\) gives \(2r+6s\). Exam tip: Write the stated multiple with each variable first, then use \(+\) for “sum.”
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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