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Answer:
Factors can be set to zero in order to find the solutions, which are the x-intercepts on a graph.
ex:
x^2 + 4x - 4
(x + 2)(x + 2)
x+2=0
x=-2
x+2=0
x=-2
-2 would be the only x-intercept on the graph.
Someone correct me if I'm wrong, thank you