SOLUTION: use g(x)=5/(1-2x) and f(x)=1-x^2 find f(-5) find the domain of g(x)

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A word about function notation. f or g or h is a function. f(x) is the value of the function f at x, g(a) is the value of the function g at a.
If , then is the value of the function f at x, so f(-5) is the value of the function at -5, i.e. . You do the arithmetic.

The domain of a function is the set of values for which the function is defined. The given function g is a rational expression that is defined everywhere except where the denominator is zero. So, if , then g is not defined.







So the domain of g is all real numbers except . In interval notation:

(,) U (,)

In set notation {x|x is real, }