Can someone explain how to do sign graphs for inequalities?
Like (x-3)(x+4)>0
Hello, mm99!
Here's one way . . .Can someone explain how to do sign graphs for inequalities?
Like: .
We have the graph of: .
This is an up-opening parabola.
We want to know when this graph is positive (above the x-axis).
Draw a sketch (or visualize it) . . .
The x-intercepts are
The graph is positive to the left and right of the intercepts.Code:| * | * | * | * * | * - - * - - - - - - + - - - - * - - -4 * | * 3 * | * * | |
Therefore: .