Which expression represents subtracting (5) times a number (n) from the square of that number?
Answer and explanation
Correct answer: \(n^2-5n\)
The square of the number \(n\) is \(n^2\), and 5 times the number is \(5n\). “Subtracting 5 times the number from its square” means subtracting \(5n\) from \(n^2\), giving \(n^2-5n\). In \(5n-n^2\), the order of subtraction is reversed. Exam tip: In “subtract A from B,” write \(B-A\).
Frequently asked questions
What is the correct answer to this question?
\(n^2-5n\)
Why is this the correct answer?
The square of the number \(n\) is \(n^2\), and 5 times the number is \(5n\). “Subtracting 5 times the number from its square” means subtracting \(5n\) from \(n^2\), giving \(n^2-5n\). In \(5n-n^2\), the order of subtraction is reversed. Exam tip: In “subtract A from B,” write \(B-A\).
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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