No.
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Yes negative 3 is a real number. 0 is the only number which...isn't a number. The is a political debate going on at the moment debating this particular topic!!!
NO, negative numbers are though. 0 is more like a placeholder. It's not a actual number. It CAN be a digit, though! Love, :D
Greater than zero because any negative number times a negative number equals a positive number.
probably x would be negative. This is because the square root of a negative number is not a real number (no real number squared can be negative). ory is 0. any number divided by 0 = infinity. and undefined is another way of saying infinity.
This is an interesting question. Looking at complex numbers graphically, zero is at the intersection of the real and imaginary axis, so it is 0 + 0i. But if you square zero, you get zero, which is not a negative number (a pure imaginary, when squared will give a real negative number), so I'd have to say it is not imaginary.