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X^2-(2.5*x)-(11/16) = 0
X^2-2.5*x-11/16 = 0
X^2-2.5*x-11/16 = 0 // - X^2-11/16
-2.5*x = -(X^2-11/16) // : -2.5
x = (-(X^2-11/16))/(-2.5)
x = -0.4*(11/16-X^2)
x = -0.4*(11/16-X^2)
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