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49 test weather the following are perfect cubes using prime factorisation meathod |
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Answer» Answer: 1331 Step-by-step explanation: a) FACTORS of 128, 128= 2×2×2 × 2×2×2 ×2 As grouping in triplets, 2 is not GROUPED. So, 128 is not a perfect CUBE. b) Factors 343, 343= 7×7×7
As grouping in triplets, all the numbers are grouped. So, 343 is a perfect cube. c) Factors of 729, 729= 3×3×3 × 3×3×3
As grouping in triplets, all the numbers are grouped. So, 729 is a perfect cube. d) Factors of 1331, 1331=11×11×11 As grouping in triplets, all the numbers are grouped. So, 1331 is a perfect cube. |
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