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What is obtained after simplifying (4(3n+2)-2(n+5))?
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Answer and explanation
Correct answer: 10n-2
Expanding the brackets gives 4(3n+2)=12n+8 and -2(n+5)=-2n-10. Therefore, 12n+8-2n-10 = 10n-2. Option B results from using the wrong sign for the constant term in the second bracket. Exam tip: multiply the number before a negative bracket by both terms inside it.
Frequently asked questions
What is the correct answer to this question?
10n-2
Why is this the correct answer?
Expanding the brackets gives 4(3n+2)=12n+8 and -2(n+5)=-2n-10. Therefore, 12n+8-2n-10 = 10n-2. Option B results from using the wrong sign for the constant term in the second bracket. Exam tip: multiply the number before a negative bracket by both terms inside it.
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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