It is 16 +/- 12*sqrt(3)*i where i is the imaginary square root of -1
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It is: 4+7 = 11
quadratics have the form ax2+bx+c=0 the discriminant is the square root of (b2-4ac) = square root of (16-16) =square root of 0 = 0
41
4x4=16 the square root of 16 is 4
16 is a perfect square (of 4) and the square root of 256.