Lesson: Sign of a Function Mathematics

In this lesson, we will learn how to determine the sign of a function from its equation or graph.

Lesson Plan

Students will be able to

determine the sign of a constant function, a linear function, or a quadratic function over specified intervals both graphically and algebraically,
determine the interval over which a function has a specified sign.

Q1:

Which of the following correctly describes the interval over which the illustrated function is negative?

Q2:

Determine the sign of the function represented by the figure below in .

Q3:

In which of the following intervals is negative?