How you would solve the following equation #2x^2-13x-7=0# by graphing?
1 Answer
In order to solve y graphing you need some way of getting a graph without solving the equation. I'll assume that you have computer graphing software (perhaps a computer of a graphing calculator).
Solutions to
The solutions to the equation
On a graph, if a value for
So, we want to look at the graph of
find the
Here's the graph. There is no "trace" feature, but you can zoom in using your mouse wheel.
graph{y=2x^2-13x-7 [-11.34, 20.7, -9.46, 6.56]}
If looks like the solutions of
are
Check that
