X2+6.6x+3.3=0

Solution for X2+6.6x+3.3=0 equation:

X2+6.6X+3.3=0

We add all the numbers together, and all the variables

X^2+6.6X+3.3=0

a = 1; b = 6.6; c = +3.3;
Δ = b2-4ac
Δ = 6.62-4·1·3.3
Δ = 30.36
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{-(6.6)-\sqrt{30.36}}{2*1}=\frac{-6.6-\sqrt{30.36}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6.6)+\sqrt{30.36}}{2*1}=\frac{-6.6+\sqrt{30.36}}{2}
$