A+Ax2=-12

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Solution for A+Ax2=-12 equation: 



+A2=-12

We move all terms to the left:

+A2-(-12)=0

We add all the numbers together, and all the variables

A^2+12=0

a = 1; b = 0; c = +12;
Δ = b2-4ac
Δ = 02-4·1·12
Δ = -48
Delta is less than zero, so there is no solution for the equation

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