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Class 9MathematicsNumber SystemsExponentsMedium
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What is the value of (3^4-3^2)?

Answer and explanation

Correct answer: 72

Evaluate the powers first: \(3^4=81\) and \(3^2=9\). Therefore, \(3^4-3^2=81-9=72\). Option 81 is only the value of \(3^4\), not the result after subtraction. Exam tip: in expressions with mixed operations, evaluate exponents before addition or subtraction.

Related tags

ExponentsOrder Of OperationsPowersNumber SystemsMathematicsClass 9 Mcq
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  1. 1If A={x:x is prime and 10<x<30}, which is its roster form?
  2. 2If 0.2020020002... has no fixed repetition, what type of number is it?
  3. 3If 0.3030030003... has no fixed repetition, what type of number is it?
  4. 4If (x=\sqrt{11}) then what is (x^2+5)?
  5. 5If (x=\sqrt{3}) then what is (x^2+x^2)?
  6. 6If (x=\sqrt{2}), what is (x^2)?
  7. 7What is the value of (2^3)?
  8. 8What is the value of (5^2)?
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  10. 10What is the value of (3^2)?
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