0.8x^2-1.2=-1

Solution for 0.8x^2-1.2=-1 equation:

0.8x^2-1.2=-1

We move all terms to the left:

0.8x^2-1.2-(-1)=0

We add all the numbers together, and all the variables

0.8x^2-0.2=0

a = 0.8; b = 0; c = -0.2;
Δ = b2-4ac
Δ = 02-4·0.8·(-0.2)
Δ = 0.64
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)-\sqrt{0.64}}{2*0.8}=\frac{0-\sqrt{0.64}}{1.6}
=-\frac{\sqrt{}}{1.6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{0.64}}{2*0.8}=\frac{0+\sqrt{0.64}}{1.6}
=\frac{\sqrt{}}{1.6}
$