How will you write twice the sum of (x) and (3)?
Answer and explanation
Correct answer: \(2(x+3)\)
First, the sum of \(x\) and \(3\) is \(x+3\). To take twice this entire sum, multiply the bracketed expression by \(2\): \(2(x+3)\). In \(2x+3\), only \(x\) has been doubled, so it is not correct. Exam tip: When you see “twice the sum,” put the complete sum inside brackets.
Frequently asked questions
What is the correct answer to this question?
\(2(x+3)\)
Why is this the correct answer?
First, the sum of \(x\) and \(3\) is \(x+3\). To take twice this entire sum, multiply the bracketed expression by \(2\): \(2(x+3)\). In \(2x+3\), only \(x\) has been doubled, so it is not correct. Exam tip: When you see “twice the sum,” put the complete sum inside brackets.
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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