1. 4. If y varies inversely as x and y=3 when x=4, find y when x=15.
5-Minute Check Lesson 4-2
4. If y varies inversely as x and y=3 when x=4, find y when x=15.
Answer: 4/5
If y varies jointly as x and z and inversely as the square of w, and y=3
when x=3, z=10 and w=2, find y when x=4, z=20 and w=4.
Answer: 2

2. 5-Minute Check Lesson 4-5

3. 4.5 – Zeros of Polynomial Equations?
How do we approximate the zeros of a polynomial function?
How can you use your graphing calculator to locate zeros?

4. Yesterday we found zeros of quadratics by 4 methods
Yesterday we found zeros of quadratics by 4 methods. What about higher degree equations like:
What is an easy way to find the zeros of this cubic function????

5. Graphical Method to Find Zeros
Use a table to approximate the location of the zeros.
Use the “Calc” menu to find the zeros themselves.
Practice:
Use your calculator to find the zeros of: