- #1
jwxie
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- 0
Homework Statement
find range for f(x) = sqrt of x-1
f(x) 1/x^2-1
Homework Equations
no...
The Attempt at a Solution
well, i know this is dumb to ask, but i am very very curious...
let say the first one, sqrt of x-1
if we want to find the range, obviously, you can tell just by looking at the function, since it is sqrt, it has to be y>0
second function, f(x)= 1/x^2-1
so i tried to use use the x-y method, you replace x with y, and y with x
so it becomes x = 1/y^2-1
now it is my range, but if i want to know the notation interval, like ( infinite, 0), then how do i solve for the range and get some actual indications for the range.