For Exercises 25–30: (a) Use a graphing utility to graph the equation. (b) Use...

For Exercises 25–30:

(a) Use a graphing utility to graph the equation.

(b) Use a graphing utility, as in Example 5, to estimate to one decimal place the x-intercepts.

(c) Use algebra to determine the exact values for the x-intercepts. Then use a calculator to check that the answers are consistent with the estimates obtained in part (b).