Anything less than zero would be a negative number.
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any negative number is less than zero
A negative number is defined as a number that is less than zero. Positive numbers, on the other hand, are more than zero. You can see that positive numbers are greater than negative numbers because they are all above zero, which negative numbers are not.
If the discriminant of a quadratic equation is less than zero then it has no solutions.
If they are quadratic equations then if their discriminant is less than zero then they have no solutions
If the discriminant of a quadratic equation is less than zero then it will not have any real roots.