Which expression is obtained after simplifying (5(2x-1)+3)?
Answer and explanation
Correct answer: 10x - 2
Using the distributive property, \(5(2x-1)=10x-5\). Adding 3 gives \(10x-5+3=10x-2\). Therefore, the correct expression is \(10x-2\). \(10x+2\) results from incorrectly combining \(-5\) and 3. Exam tip: When opening brackets, multiply the outside number by every term inside the bracket.
Frequently asked questions
What is the correct answer to this question?
10x - 2
Why is this the correct answer?
Using the distributive property, \(5(2x-1)=10x-5\). Adding 3 gives \(10x-5+3=10x-2\). Therefore, the correct expression is \(10x-2\). \(10x+2\) results from incorrectly combining \(-5\) and 3. Exam tip: When opening brackets, multiply the outside number by every term inside the bracket.
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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