Question: Use a graphing utility to verify the results in Example 4. For instance, the graph of y = x2 + 2x + 4 is shown

Use a graphing utility to verify the results in Example 4. For instance, the graph of y = x2 + 2x + 4 is shown below. Notice that the y-values are greater than 0 for all values of x, as stated in Example 4(a). Use the graphing utility to graph y = x2 + 2x + 1, y = x2 + 3x + 5, and y = x2 ˆ’ 4x + 4. Explain how you can use the graphs to verify the results of parts (b), (c), and (d) of Example4.

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