solving a quadratic equation by graphing

solve (x^2)- 2x - 8 = 0 by graphing

graph y = x² -2x -8 using a calculator or a piece of paper
the graph is shown below
see where the graph cuts the x-axis
in this problem x = -2 and x=4 are the roots

graphical solution of system of two simultaneous linear equations in two unknowns
solve graphically 3x-7y+10=0 , 2x-y+3=0 graphical solution
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