For Exercise:
(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).
EXAMPLE 5 Finding approximate and exact values for x-intercepts
2xy − x3 − 5 = 0
Hint: See Example 6(b) and the caption for Figure 11.
EXAMPLE 6(b) Obtaining information about a graph through its equation
SOLUTION
Figure 11
To graph x2y − x3 + 3 = 0, first solve for y:
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