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I'm not quite sure, but when the number inside the radical (square root sign) is negative, there is a no real-number solution.
Its the inside of the parenthisis. Ex: Square root sign ( any number of your choice)
You don't. If the negative sign is outside the radical, then you take the square root of the number and apply the negative. If the negative sign is inside the radical, you will have an imaginary number.
The number under the radical sign (also known as the radical) is called the radican.
A number under a radical sign is known as a radicand.