- #1
destinc
- 17
- 0
f(x)= x=1/x-1 if x ≤ 0
x^2-2x +1 if 0 < x < 1
ln x if x ≥ 1
Here's what I have so far
lim f(x)= lim x+1/x-1= -1, LHL= -1
x →0- x→0-
lim f(x)= lim x^2-2x+1= (1/2)^2 - [(2)1/2] +1= 1/4, RHL= 1/4
x→0+ x→0+
RHL ≠ LHL ∴ f(x) is not differentiable @ 0
Now I know I need to test x=1 for differentiability, but I am stuck on how to do that
I can take f ' (x)= 1/x which is continuous for all except 0, but not sure how to test limits
since there is no LHL with x ≥ 1
x^2-2x +1 if 0 < x < 1
ln x if x ≥ 1
Here's what I have so far
lim f(x)= lim x+1/x-1= -1, LHL= -1
x →0- x→0-
lim f(x)= lim x^2-2x+1= (1/2)^2 - [(2)1/2] +1= 1/4, RHL= 1/4
x→0+ x→0+
RHL ≠ LHL ∴ f(x) is not differentiable @ 0
Now I know I need to test x=1 for differentiability, but I am stuck on how to do that
I can take f ' (x)= 1/x which is continuous for all except 0, but not sure how to test limits
since there is no LHL with x ≥ 1