Yes.
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No. In general, the square root of a negative number is an imaginary number, which is not a real number.
It is a negative integer, a negative rational integer, a negative real number.
No, it is not, because real numbers include negative numbers. The square root of a negative number is an imaginary number
A negative number times a negative number gives you a POSITIVE number, not a negative number.
Subtracting a negative number is the same as adding a positive number. In this instance, 14 - (-20) = 14 + 20 = 34.