Use the general solutions from the quadratic formula to show that the average value of the x -intercepts is 2a −b ​ . Explain/Discuss why the result is valid even if the roots are complex. x 1 ​ = 2a −b+ b 2 −4ac ​ ​ ,x 2 ​ = 2a −b− b 2 −4ac ​ ​