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3-66.

Complete the tables in the eTool below.
Click the link at right for the full version of the eTool: AC 3-66 HW eTool

Substitute positive and negative values for x and solve for y.

What are the shapes of the graphs of part (a) and part (b)?

The y = x² graph points upward and the y = −x² graph points downward.

Estimate the x-value where the line y = 5 intersects the parabola. (See graph for the line y = 5)

See the hint in part (d).