y^2-2y=-21

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Solution for y^2-2y=-21 equation: 



y^2-2y=-21

We move all terms to the left:

y^2-2y-(-21)=0

We add all the numbers together, and all the variables

y^2-2y+21=0

a = 1; b = -2; c = +21;
Δ = b2-4ac
Δ = -22-4·1·21
Δ = -80
Delta is less than zero, so there is no solution for the equation

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