limit as x approaches 1 x^2-4/x-1
Evaluate expression as x->1, (x²-4)/(x-1)
=(1-4)/0
=-∞
When it evaluates to 0/0 or ∞/∞ then other techniques are required to evaluate the limit.
=(1-4)/0
=-∞
When it evaluates to 0/0 or ∞/∞ then other techniques are required to evaluate the limit.