Question 9 - End-of-Chapter Exercises - Chapter 3 Class 9 - The World of Numbers (Ganita Manjari I)
Last updated at May 12, 2026 by Teachoo
End-of-Chapter Exercises
Question 1
Important
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Class 9
Chapter 3 Class 9 - The World of Numbers (Ganita Manjari I)
- The Human Need to Count
- Exercise Set 3.1
- The Revolution of Śhūnya
- Integers
- Exercise Set 3.2
- Rational Numbers
- Exercise Set 3.3
- Rational Numbers on the Number Line
- Absolute Value of a Rational Number
- Rational Numbers between two Rational numbers
- Exercise Set 3.4
- Irrational Numbers
- Construction of Length √n on Number line
- The Story of Pi (π) and Madhava’s Infinite Series
- Real Numbers & Imaginary Numbers
- Decimal Expansion of Real Numbers
- Magic of Cyclic Numbers
- Constructing a Square Root Spiral
- Exercise Set 3.5
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End-of-Chapter Exercises
Transcript
Question 9 Let a and b be two non-zero rational numbers such that 𝑎+1/𝑏=0 Without assigning any numerical values, determine whether ab is positive or negative. Justify your answer. Given that 𝒂+𝟏/𝒃=𝟎, and a ≠ 0, b ≠ 0 Now, 𝑎+1/𝑏=0 𝑎=0−1/𝑏 𝑎=(−1)/𝑏 Cross multiplying 𝑎 × b=−1 𝒂𝒃=−𝟏 Thus, product ab is negative
