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    Question

    The cube of the difference between two given natural

    numbers is 1728, while the product of these two given numbers is 108. Find the sum of the cubes of these two given numbers.
    A 6048 Correct Answer Incorrect Answer
    B 5616 Correct Answer Incorrect Answer
    C 6024 Correct Answer Incorrect Answer
    D 5832 Correct Answer Incorrect Answer

    Solution

    1st natural number = x 2nd natural number = y (x - y)3 = 1728 (x - y) = 3тИЪ1728 = 12 squaring both sides ┬а (x - y) ┬▓ = 144 x2+y2-2xy =144 x┬▓ + y┬▓ = 144 + 216 = 360 Now, (x + y) = тИЪ (x┬▓ + y┬▓ + 2xy) =тИЪ (360 + 216) = тИЪ576 = 24 (x + y) ┬│ = x┬│ + y┬│ + 3xy x (x + y) x┬│ + y┬│ = (x + y) ┬│ -3xy ├Ч (x + y) = (24)3 - 3 x 108 x 24 =13824-7776 = 6048

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