### Home > CAAC > Chapter 3 > Lesson 3.1.7 > Problem 3-66

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* = *x*² graph points upward and the *y* = −*x*² 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).