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What is the value of (20^2-100)?
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Answer and explanation
Correct answer: 300
First evaluate the exponent: \(20^2=20\times20=400\). Then \(400-100=300\). Therefore, the correct answer is 300. A value such as 350 can result from an error in subtraction. Exam tip: In an expression with brackets, evaluate the exponent before performing subtraction.
Frequently asked questions
What is the correct answer to this question?
300
Why is this the correct answer?
First evaluate the exponent: \(20^2=20\times20=400\). Then \(400-100=300\). Therefore, the correct answer is 300. A value such as 350 can result from an error in subtraction. Exam tip: In an expression with brackets, evaluate the exponent before performing 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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