Question

Using graphical method solve the equation;x²-3x-4=0

Answer 1

Let us draw the graph of the function $y=x^2-3x-4$

The parabola intersects the $X$ axis at points $-1$ and $4$. And it is solution of the equation $x^2-3x-4=0$: $x_1=-1$; $x_2=4$.

Solution: $x_1=-1$; $x_2=4$.