3. Sketch each of the following polynomial functions without a calculator. Clearly label all zeros and the y-intercept. The graphs: do not need to be drawn to scale. a] y =xfx3}(x+4] on; = (x 1}(x+2)2(x3} '5" '5" c)y = x3 - 5x2 - 12x + 36 d) y = x4 + 3x3 - 14x2 - 12x + 40 X3. a] C) d) At 36 40 -2 1 2 -5 -2/ -12