why is the expression x1/2 is undefined when x is less than 0?
1 Answer
Mar 1, 2018
Use the definition of a square root.
Explanation:
Observe that
The value of
Let
If x = 0 then c = 0.
Otherwise
If c is a positive real number, then
If c is a negative real number, then
It is impossible for the square of a real number to be negative.
Therefore, it is impossible for x to be negative.