12. For the function f(a:) = (1:133 -| b.9132 5:1; + 9, determine the values ofa and b so that f(1) = 12 and f'(1) = 3. [5 marks] 14. Two particles have positions at time t given by $1 = 4t - t2 and $2 = 5t - to. When the acceleration of the two particles are equal, find the positions and velocities of both particles. [5 marks]