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Subjects
Class 9MathematicsNumber SystemsExponentsMediumLevel 6
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What is the value of (23^2-129)?

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Answer and explanation

Correct answer: 400

First evaluate the exponent: \(23^2=23\times23=529\). Then \(529-129=400\), so the correct answer is 400. The value 529 is only \(23^2\); 129 must still be subtracted. Exam tip: evaluate exponents before performing subtraction in such expressions.

Related tags

Number SystemsExponentsInteger OperationsOrder Of OperationsMental Arithmetic

Frequently asked questions

What is the correct answer to this question?

400

Why is this the correct answer?

First evaluate the exponent: \(23^2=23\times23=529\). Then \(529-129=400\), so the correct answer is 400. The value 529 is only \(23^2\); 129 must still be subtracted. Exam tip: evaluate exponents before performing subtraction in such expressions.

Which subject and chapter does this question cover?

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

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