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Subjects
Class 9MathematicsNumber SystemsExponentsMediumLevel 5
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What is the value of (21^2-41)?

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Answer and explanation

Correct answer: 400

First find the square of 21: \(21^2=441\). Then \(441-41=400\), so the correct answer is 400. Option 410 can result from an error in subtraction. Exam tip: In an expression with exponents, evaluate the exponent before performing addition or subtraction.

Related tags

ExponentsOrder Of OperationsSquaresInteger ArithmeticNumber Systems

Frequently asked questions

What is the correct answer to this question?

400

Why is this the correct answer?

First find the square of 21: \(21^2=441\). Then \(441-41=400\), so the correct answer is 400. Option 410 can result from an error in subtraction. Exam tip: In an expression with exponents, evaluate the exponent before performing addition or subtraction.

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: Exponents.

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  5. 5If (x=\sqrt{3}) then what is (x^2+x^2)?
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