Question 391760
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Hi, previously posted        
Finding the x-intercepts of the graph of the following equation
    y = x^2 - 1      [parabola crosses x-axis when y = 0
    0 = x^2 - 1
    x^2 = 1
    x = ± 1  x-intercepts are points Pt(-1,0) and Pt(1,0)
{{{drawing(300,300, -6, 6, -6, 6, grid(1),
circle(1, 0,0.3),
circle(-1, 0,0.3),
graph( 300, 300, -6, 6, -6, 6,x^2-1))}}}