4 square root of 7
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The square root of minus 8 is equal to the square root of 8 times the square root of minus 1, or 2.8284i.
7 for 49 and 8 for 64
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.
It is: 2 times the square root of 2
Sq root of 2 * sq root of 8 = 1.414 * 2.828 = 3.998792