Challenge your students to examine student work in solving a difficult quadratic function problem. Three student responses are included, along with a chart for students to explain the reasoning and find mistakes.
Spoiler: Each one has an error!
Great way to get students to think deeper and consider multiple methods to solving.
The problem included in this activity:
Given the function f(x) = -x^2 - 4x + 45, use a number line to show all the values of x for which f(x) ≥ 0.