Which of the quadratic functions below has exactly one x-intercept?

1) y = x2 − 9
2) y = x2 − 6x + 9
3) y = x2 − 5x + 6
4) y = x2 + x − 6

Consider the following equation. 1/2x^3+x-7=-3sqrtx-1 approximate the solution to the equation using three iterations of successive approximation. use the graph below as a starting point. a. b. c. d.