21. To graphically solve the quadratic equation x2+2x-11= 6 all of these are practical ways to solve the quadratic graphically Use the quadratic formula, letting a = 1, b = 2, and c = -17. let y = x2+2x-11 and y2 = = 6. Find the points at which they intersect. Set the equation y = x + 2x - 11 equal to 0. Then find the roots of the graph. The alone intercont form for the countion of the