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n^2=-28
We move all terms to the left:
n^2-(-28)=0
We add all the numbers together, and all the variables
n^2+28=0
a = 1; b = 0; c = +28;
Δ = b2-4ac
Δ = 02-4·1·28
Δ = -112
Delta is less than zero, so there is no solution for the equation
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