Solving Equations and Inequalities Graphically
Using a graphing calculator: LEARN how to change the
Zoom 6: Standard Screen
Graph: y1 =x3 - 4x2 -129x + 396
An appropriate viewing window should show relative max,
relative min, intercepts; or we may
want to zoom in or out to see intersection of lines.
Graphing a circle: x2 +y2 = 9
The graphical solution to: 2x = 6 -x
Algebraic solution gives exact solution, whereas graphing
solution is often an approximations.
•Do these lines intersect?
Solve: over the interval [ 1, 6 ].
Solving equations graphically x2 + 5x + 6 > 0
Solving equations graphically x3 - 4x2-129x + 396 > x2 + 6x + 125