(a) Graph the equation y = x4 + x2 - 6. (b) On the basis of the graph, how many...

(a) Graph the equation y = x⁴ + x² - 6.

(b) On the basis of the graph, how many roots are there for the equation x⁴ + x² - 6 = 0? Use the graph to estimate these roots. Zoom in until you are sure about the first three decimal places of each root. Then compare your estimates to the actual values obtained in Example 3(b).

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