The solution(s) to x^2 -4 = 0 shows you where the curve f(x) = x^2 -4 crosses the x-axis (+2 & -2).
The curve f(x) = x^2 +4 does not cross the x-axis and the solutions to x^2 + 4 = 0 are complex (+2i & -2i).
What does this represent graphically?
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