Question

How do you solve `x^2+3x-4=0` graphically?

Answer 1

See below.

Explanation:

Plot the points generated by the function `y = x^2 + 3x -4`.

Where the parabola crosses or turns at the `x` axis is the solution to the equation `x^2 + 3x -4 = 0`.

In this example the parabola crosses the `x` axis at the points `x = -4` and `x = 1` , so this is the solution to the equation.
See graph:

graph{x^2 +3x -4 [-16.02, 16.01, -8.01, 8.01]}