Evaluation of left hand and right hand limits

The statement x→aˉ means that x is tending to a from the left hand side.

The statement x→a⁺ means that x is tending to a from the right hand side.

Steps to find left hand limit

Put x = a-h and replace x→aˉ by h→0. Find limit of f(a-h) as h→0


Steps to find right hand limit

Put x = a+h and replace x→a⁺ by h→0. Find limit of f(a+h) as h→0