4(x-0.8)X=4

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Solution for 4(x-0.8)X=4 equation:



4(x-0.8)x=4
We move all terms to the left:
4(x-0.8)x-(4)=0
We multiply parentheses
4x^2-3.2x-4=0
a = 4; b = -3.2; c = -4;
Δ = b2-4ac
Δ = -3.22-4·4·(-4)
Δ = 74.24
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{-(-3.2)-\sqrt{74.24}}{2*4}=\frac{3.2-\sqrt{74.24}}{8} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3.2)+\sqrt{74.24}}{2*4}=\frac{3.2+\sqrt{74.24}}{8} $

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