4 + 9 = -4 +9 or +4 +9 that is 5 or 13
sqrt(16+9) = sqrt(25) =±
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It is: 4+7 = 11
It is 16 +/- 12*sqrt(3)*i where i is the imaginary square root of -1
sqrt(160) = sqrt(16*10) = sqrt(16)*sqrt(10) = 4*sqrt(10)
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
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