THREE / 25 MARKS) Note: Ensure you show your formulars and working. Also, note that you can represent the following symbols as follows: ^ for the exponent symbol, X ^ ^ 2 instead of x ^ 2 ; 2 ^ 2 as 2 ^ ^ 2 division as / or ; + individually as + or -; sqrt b as square root of b. Any other symbol that you find difficult can be typed out in words 3.1 Given that a line AB passes through points A (-3, 1) and B(- 1, 5) a. Find the gradient of the line AB. b. Find the equation of the line AB. 555 (5) (5) (5) C. Determine the midpoint of AB. 3.2 Evaluate the following limits a. lim x -> 3 (x ^ 2 - 10x + 21)/(x ^ 2 + x - 12) b. lim x -> 1 (2x ^ 3 - 3x - 9)/(x ^ 2 - 4x + 2)