S=2x^2-40x+400

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Solution for S=2x^2-40x+400 equation: 



=2S^2-40S+400

We move all terms to the left:

-(2S^2-40S+400)=0

We get rid of parentheses

-2S^2+40S-400=0

a = -2; b = 40; c = -400;
Δ = b2-4ac
Δ = 402-4·(-2)·(-400)
Δ = -1600
Delta is less than zero, so there is no solution for the equation

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