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What is obtained after simplifying (4x+7-9x+2)?
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Answer and explanation
Correct answer: \(-5x+9\)
Combining the like variable terms gives \(4x-9x=-5x\), and the constant terms give \(7+2=9\). Therefore, the simplified expression is \(-5x+9\). In \(5x+9\), the sign of \(4x-9x\) has been handled incorrectly. Exam tip: add or subtract only like terms.
Frequently asked questions
What is the correct answer to this question?
\(-5x+9\)
Why is this the correct answer?
Combining the like variable terms gives \(4x-9x=-5x\), and the constant terms give \(7+2=9\). Therefore, the simplified expression is \(-5x+9\). In \(5x+9\), the sign of \(4x-9x\) has been handled incorrectly. Exam tip: add or subtract only like terms.
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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