Question 274142
n^2 + 4n +4 =0 
Both the 1st and last terms are squares, so it's easy to factor.
(n + 2)^2 = 0
n = -2
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There's one solution, or the same solution twice.
The graph is a parabola, and it's tangent to the x-axis at x = -2
Or n-axis.