3*sqrt(16) - 5*sqrt(64) = 3*4 - 5*8 = 12 - 40 = -28
For such sums, it is normal to consider only the principal square roots.
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Negative 64 is the square root of an integer. The square root of -64 is not an integer.
The square root of 64 equals 8. 8x8=64
The square root of 64 is ± 8
the square root of 64 is 8
The square root of 64 is 8(8 x 8 = 64)