Hi,

f(x) = 3x+4

So I found the inverse:

f(x) = 3x+4

x=3y+4

x-4=3y

y=x-4/3

Then it asks to find the domain and range. So...could someone help me? I'm not sure on how to find them.

Printable View

- Aug 14th 2008, 04:31 AMlax600Function Question
Hi,

f(x) = 3x+4

So I found the inverse:

f(x) = 3x+4

x=3y+4

x-4=3y

y=x-4/3

Then it asks to find the domain and range. So...could someone help me? I'm not sure on how to find them. - Aug 14th 2008, 04:44 AMmasters
- Aug 14th 2008, 04:44 AMmoolimanj
The inverse is simply:

f(x)^-1=(Y-4)/3

Try drawing a simple graph of the equation to see where the domain lies.

Note that when Y=4, x=0 - Aug 14th 2008, 04:57 AMmr fantastic
- Aug 14th 2008, 05:17 AMmoolimanj
Good observation Mr F

Apologies, I meant to put the equation as a function of x after I rearranged.

Spot on with the point about the graph - Aug 14th 2008, 07:02 AMlax600
- Aug 14th 2008, 07:11 AMmasters