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Ex 7.1, 1 - Chapter 7 Class 8 Cubes and Cube Roots - Part 2

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Ex 7.1, 1 Which of the following numbers are not perfect cubes? (ii) 128Doing Prime factorization of 128 We see that 128 = 2 × 2 × 2 × 2 × 2 × 2 × 2 Since 2 does not occur in triplets, ∴ 128 is not a perfect cube. Doing Prime factorization of 128 We see that 128 = 2 × 2 × 2 × 2 × 2 × 2 × 2 Since 2 does not occur in triplets, ∴ 128 is not a perfect cube.

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