0.7x2-4.3x+5.5=16000000

Solution for 0.7x2-4.3x+5.5=16000000 equation:

0.7x^2-4.3x+5.5=16000000

We move all terms to the left:

0.7x^2-4.3x+5.5-(16000000)=0

We add all the numbers together, and all the variables

0.7x^2-4.3x-15999994.5=0

a = 0.7; b = -4.3; c = -15999994.5;
Δ = b2-4ac
Δ = -4.32-4·0.7·(-15999994.5)
Δ = 44800003.09
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{-(-4.3)-\sqrt{44800003.09}}{2*0.7}=\frac{4.3-\sqrt{44800003.09}}{1.4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4.3)+\sqrt{44800003.09}}{2*0.7}=\frac{4.3+\sqrt{44800003.09}}{1.4}
$