1. Solve quadratic equation
Solving quadratic and quadratic form equations using the graphing calculator
Y =
Solve quadratic equation
Standard
window view
ZOOM
WINDOW
Math 99 D.Sluys

2. Use Zoom Box
ZOOM
1:ZBox 2 1 -1 1 2 -1 -2 -3 -4

3. Use Trace to estimate solutions Use arrow keys to move cursor
along curve
TRACE
Under
estimate
Over
estimate

4. Second solution estimated using TRACE
Under
estimate
Over
estimate

5. we estimate two solutions to the equation
Using Trace feature,
we estimate two solutions to the equation
One between and
And one between and
To get a more accurate answer, use
2nd function CALC features
2nd
CALC

6. 2nd
CALC
2:ZERO
solution

7. Calculate other zero
2nd
CALC
2:ZERO
solution

8. Using Trace feature,
we estimated two solutions to the equation
One between and
And one between and
Using 2nd function CALC feature,
We get more accurate solutions
to the same equation:
x = and x =

9. Algebraically, we solved: Solve this same equation using calculator

10. Graph equation
Standard window
size shows one
root about -8
Another
window
size can
show two
roots but
with low
accuracy

11. Choose window size to focus on areas with roots

12. Use calculator to get a feel for type of roots
2 real roots
1 real repeated root
Two imaginary roots

13. Use calculator to get a feel for type of roots

14. Challenge: