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-2y(y-4)-10=20-2y-12
We move all terms to the left:
-2y(y-4)-10-(20-2y-12)=0
We add all the numbers together, and all the variables
-2y(y-4)-(-2y+8)-10=0
We multiply parentheses
-2y^2+8y-(-2y+8)-10=0
We get rid of parentheses
-2y^2+8y+2y-8-10=0
We add all the numbers together, and all the variables
-2y^2+10y-18=0
a = -2; b = 10; c = -18;
Δ = b2-4ac
Δ = 102-4·(-2)·(-18)
Δ = -44
Delta is less than zero, so there is no solution for the equation
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