examine 400 is a perfect cube if not then find the smallest number that must be subtracted from 400 to obtain a perfect cube
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39
400=2×2×2×2×5×5=(2×2×2)×2×5×5
hence it is not a perfect square.
closest perfect cube to 400 is 343 that is cube of 7.
so 57 must be subtracted.
hence it is not a perfect square.
closest perfect cube to 400 is 343 that is cube of 7.
so 57 must be subtracted.
Answered by
13
57 must be subtracted from 400 to make perfect cube
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