Question 585881
The graph is shown below


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,x^2 - 4)

)}}}


The graph crosses the x-axis at (-2,0) and at (2,0). So the roots are -2 and 2.

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