Question

How to find the domain codomain and range of a function?

Answer 1

Domain of a function refers to the values that the variable can take.
Some Ground rules for finding them is:
1.The denominator is not equal to 0.
2.The Term under Even root is greater than or equal to 0.

The Range refers to values that That the fuction can take.
To find them Write the variable of function in terms of f(x) and find the domain of f(x).
Eg. the Range of f(x)=x²    
x=√f(x) since any term under even root is ≥0
f(x)≥0 ... Range=[0,∞).
Codomain is the superset of Range
Eg . in the above case Codomain is R(real numbers)
But Range is $R^{+}$ (positive reals)