Practice 9) making mental images. find the discriminant of each equation. explain what it tells you about the equations roots and graph. 1. 5x^2+4x-3=0 discriminant= roots: the equation roots. graph: the graph crosses the x-axis . 2. 9x^2+6x+1=0 discriminant= roots: the equation ? real root. graph: the graph only touches the x-axis .(it never crosses the x-axis.) 3. x^2+2x+7=0 discriminant= roots: the equation roots graph: the graph x-axis