Find the x
F(3) = 4x - 2
10
f(x) = 2x +3
All Real Numbers
This case produces 99% of all domains to be all real numbers.
Case 1
f( -2) = 3x2 + 2x - 1
7
We always read a graph from...
Left to Right
f(-2) = 2x^2 - 2
6
f(x) = -5x +9
All Real Numbers
This case, in most cases require x to be a positive number.
Case 2
f(4) = x3+6
70
When finding domain, you look at which variable?
x
f(3) = -3x+x^3
18
f(x) = sqrt(2x)
[0, infinity)
This case, you have to consider dividing by zero.
Case 3
f(2) = 2x/(3x2+2)
2/7
The domain deals with this axis
x axis
f(1/2) = 6x - 6
-3
f(x) = 5/(x+1)
All Real numbers, except x not equal to -1
This case has no domain
Not a function
f(-5) = 5x2+1-x3
1
A circle has a domain of?
None, it is not a function
f(-1/3) = 9x +3/x
-12
f(x) = sqrt(3-x)
(-infinity, 3]
In this case yu often have to jump over a specific value.
Case 3
f(-1) = x7+1
0
A function with a domain of 3 only looks like?
A vertical line at x = 3