5x^2-0.8=0

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Solution for 5x^2-0.8=0 equation: 



5x^2-0.8=0

a = 5; b = 0; c = -0.8;
Δ = b2-4ac
Δ = 02-4·5·(-0.8)
Δ = 16
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{16}=4$


$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4}{2*5}=\frac{-4}{10}
=-2/5
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4}{2*5}=\frac{4}{10}
=2/5
$

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