13. Consider the function y = = - 2(x + 1)(x - 3). a) State the x-intercepts of the function. [A/2] b) State the vertex of the function. [A/2] c) State the y-intercept of the function. [A/1] d) Sketch a graph of the function showing the vertex, the x-intercepts and the y-intercept.[C/3] Page 3 5 +|_|_|_|_|_|_|_|_|_|_|_|_|_l_l_|_|_|_|_l_| e) Identify the intervals fer which the function is i) positive or negative ii) increasing or decreasing