What is obtained after simplifying (4m-(2m-7))?
Answer and explanation
Correct answer: \(2m+7\)
A minus sign before a bracket changes the sign of every term inside it: \(4m-(2m-7)=4m-2m+7=2m+7\). Therefore, \(2m+7\) is correct. \(2m-7\) would result if the sign of \(-7\) were not changed. Exam tip: Before removing brackets, check the sign immediately preceding them.
Frequently asked questions
What is the correct answer to this question?
\(2m+7\)
Why is this the correct answer?
A minus sign before a bracket changes the sign of every term inside it: \(4m-(2m-7)=4m-2m+7=2m+7\). Therefore, \(2m+7\) is correct. \(2m-7\) would result if the sign of \(-7\) were not changed. Exam tip: Before removing brackets, check the sign immediately preceding them.
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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