Question

16. Find the smallest number which when
multiplied with the following will make
the product a perfect cube. Also find the
cube root of the product.
(i) 210125​

Answer 1

Answer:

On factorising 210125 into prime factors, we get: 210125 = 5 x 5 x 5 x 41 x 41

On grouping the factors in triples of equal factors, we get: 210125 = {5 x 5 x x 41 x 41

It is evident that the prime factors of 210125 cannot be grouped into triples of equal factors such that no factor is left over. Therefore, 210125 is not a perfect cube. However, if the number is multiplied by 41, the factors can be grouped into triples of equal factors such that no factor is left over.

Hence, the number 210125 should be multiplied by 41 to make it a perfect cube. Also, the product is given as: 210125 x 41 = {5 x 5 x 5} x {41 x 41 x 41} 8615125 = {5 x 5 x x {41 x 41 x 41} To get the cube root of the produce 8615125, take one factor from each triple. The cube root is 5 x 41 = 205. Hence, the required numbers are 41 and 205.

Step-by-step explanation:

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