### Home > CCA2 > Chapter 9 > Lesson 9.3.1 > Problem9-78

9-78.

John has to graph a set of parabolas of the form $y = x^2 - 4x + 2^n$ where $n$ is an integer and $0 ≤ n ≤ 6$. What is the probability that one of these parabolas, chosen at random, will have: 9-78 HW eTool (Desmos).

1. One $x$-intercept?

2. Two $x$-intercepts?

1. No $x$-intercepts?

Use the eTool below to help you with this problem.
Click on the link at right for the full eTool version: CCA2 9-78 HW eTool