4. If y varies inversely as x and y=3 when x=4, find y when x=15.

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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

5-Minute Check Lesson 4-5

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?

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????

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: