math
posted by Jackie on .
f(x)= 1/x^28x9
g(x)= 1/x^2+3x+2

What is required to find? :3

Domain

Domain of what?
If the required is their individual domains:
1. For f(x) = 1/(x^2  8x  9)
Note that domain is the set of all possible values of x. In the function, note that the denominator must not be equal to zero because 1/0 is infinity. Therefore, we find the values of x, which the denominator will be zero and restrict the domain to those values:
f(x) = 1/(x^2  8x  9)
f(x) = 1/(x9)(x+1)
Thus, x is all real numbers except 1 and 9.
2. For g(x) = 1/(x^2 + 3x + 2)
The procedure is pretty much the same. We find the values of x which will make the denominator zero:
g(x) = 1/(x^2 + 3x + 2)
g(x) = 1/(x+1)(x+2)
Thus, x is all real number except 1 and 2.
Hope this helps~ :3