Use a pattern to prove that (-2)-(-3)=1

Question: What is the limit of (3x^2 - 2x + 1) / (x + 1) as x approaches 2?

Question: What is the area, in square units, of a triangle with base length 8 units and height 12 units?

Find the limit as x approaches 3 of (x^2 - 9)/(x - 3).