SOLVING QUADRATICS DAY 3 (IN THE CALCULATOR)

EQ: How can points of intersection be used to solve any equation?

Task: Find all of the solutions of the equation

using the graphing calculator

I’m being asked to…

I’ll know I have the correct answers if …

The expression on the left side of the equal sign is ….

The value on the right side of the equal sign is…

Let’s Solve It!

Y1 = __________________________ (Black)

Y2 = __________________________ (Red)

a. How can you tell by looking at the table what the solutions will be?

b. How can you tell by looking at the graph what the solutions will be?

c. What are your solutions? X = ________ and X = _________

d. Check your solutions:

  

  e. In what situation would this method NOT work? Why?

Press 2nd, Calc (Trace button) and look at your different choices.

Which option could be used to find the exact solutions?

First Curve? Second Curve?Guess?

Calc Practice

Ex 1) Solve using the calculator

Solutions: _______________________

Ex 2) Solve using the calculator

Solutions: _______________________

Summary

Problems with you may encounter:

“Error” message:

1) Did you put the equations in correctly?

2) Do you need to change the window? Answer are written in radical form:

1) Do you have enough time to do the quadratic formula?

2) Can you determine which radical expression is equivalent?

Check your solutions:

You Try! Solve for x using the calculator: x(x – 5) = -3x + 1

Do you HAVE to simplify the expressions first?

Do you HAVE to set the equation equal to zero?

#1 Find the left intersection and wait for me to check it!

Find the left intersection and wait for me to check it!

Find the left intersection and wait for me to check it!

Find the left intersection and wait for me to check it!

Find the left intersection and wait for me to check it!

Find the left intersection and wait for me to check it!