### Home > INT3 > Chapter 2 > Lesson 2.2.2 > Problem2-64

2-64.

Your friend is not allowed to use a graphing calculator in her math class. Homework Help ✎

1. Explain to her how she can make a good sketch of the graph of the function $y=2(x+3)^2-8$ without using a calculator and without having to make a table. Be sure to explain how to locate the vertex, whether the parabola opens upward or downward, and how its shape is related to the shape of the graph of $y=x^2$.

Where will the vertex be? Does the parabola open up or down? Is it vertically stretched?

2. Your friend also needs to know the $x$‑ and $y$‑intercepts. Show her how to calculate them without having to draw an accurate graph or use a graphing calculator.

Substitute $0$ for $x$ and solve for $y$ to find the $y$-intercepts.
Substitute $0$ for $y$ and solve for $x$ to find the $x$-intercepts.