-z2+20=21

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Solution for -z2+20=21 equation: 



-z2+20=21

We move all terms to the left:

-z2+20-(21)=0

We add all the numbers together, and all the variables

-1z^2-1=0

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

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