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What is the value of (9^2-5^2)?
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Answer and explanation
Correct answer: 56
First evaluate the powers: 9^2 = 81 and 5^2 = 25. Therefore, 9^2 - 5^2 = 81 - 25 = 56, so 56 is correct. Exam tip: calculate both squares before subtracting; alternatively, use the difference of squares: (9 - 5)(9 + 5) = 4 × 14 = 56.
Frequently asked questions
What is the correct answer to this question?
56
Why is this the correct answer?
First evaluate the powers: 9^2 = 81 and 5^2 = 25. Therefore, 9^2 - 5^2 = 81 - 25 = 56, so 56 is correct. Exam tip: calculate both squares before subtracting; alternatively, use the difference of squares: (9 - 5)(9 + 5) = 4 × 14 = 56.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: Exponents.
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