y=-X^2+14-21

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Solution for y=-X^2+14-21 equation: 



y=-y^2+14-21

We move all terms to the left:

y-(-y^2+14-21)=0

We get rid of parentheses

y^2+y-14+21=0

We add all the numbers together, and all the variables

y^2+y+7=0

a = 1; b = 1; c = +7;
Δ = b2-4ac
Δ = 12-4·1·7
Δ = -27
Delta is less than zero, so there is no solution for the equation

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