I have a problem that says

f(x)= x^2 L=4 Xo= -2 e= 0.5

I have to find the value of delta.

Do I start by setting it up as

-.5 < x^2 -4 < .5??

sq root 3.5 < x < sq root 4.5

Then I take the larger absolute value of the 2....

sq root 4.5 - 2 = .12

Did I do this problem correctly?