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What do the letters in mathematics stand for?
Some letters such as e is a number, and i stands for imaginary number. But most letters are variables. x is a common variable. A variable is basically a number that you don't know so you just call it x.
How is the word domain used in algebra?
Domain is used to refer to the x (or the independent variable).
Domain and range?
In algebra, the domain consists of all possible values for the x variable that could make the function work. The range is all of the possible values of the function, using each number in the domain.
Does anything squared equal negative on and that number squared?
If I understand the question correctly, the answer is not in real numbers. But in the complex domain, there is the imaginary number i is such that i2 = -1. And so, for any positive x, [i*sqrt(x)]2 = i2*x = -1*x = -x, which is negative.
X x x is always a positive number?
No. Not is x = 0 or if it an imaginary number.
