0.28x^2-0.08x-0.27=0

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Solution for 0.28x^2-0.08x-0.27=0 equation: 



0.28x^2-0.08x-0.27=0

a = 0.28; b = -0.08; c = -0.27;
Δ = b2-4ac
Δ = -0.082-4·0.28·(-0.27)
Δ = 0.3088
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-0.08)-\sqrt{0.3088}}{2*0.28}=\frac{0.08-\sqrt{0.3088}}{0.56}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-0.08)+\sqrt{0.3088}}{2*0.28}=\frac{0.08+\sqrt{0.3088}}{0.56}
$

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