is under root 8 is a rational number
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The square root of 8 is irrational and real.
The square root of 8 over 25 is irrational, and real.
No real number multiplied by itself can give a negative result,so no real number can be a square root of -8 .The answer is called an 'imaginary' number. It's [ 2.8284 i ] .The '2.8284' part is the regular square root of 8, rounded, andthe ' i ' is a symbol that means "the square root of -1".
Cube root of -512 = -8
That is because 1x1=1 and to be a square root, a number times the same number, it will be a square root of that number*. *Example 8 times the same number (8) will be 64 and 8 will be the square root of 64.