22=-2.7x^2+30x+6.6

Solution for 22=-2.7x^2+30x+6.6 equation:

22=-2.7x^2+30x+6.6

We move all terms to the left:

22-(-2.7x^2+30x+6.6)=0

We get rid of parentheses

2.7x^2-30x-6.6+22=0

We add all the numbers together, and all the variables

2.7x^2-30x+15.4=0

a = 2.7; b = -30; c = +15.4;
Δ = b2-4ac
Δ = -302-4·2.7·15.4
Δ = 733.68
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{-(-30)-\sqrt{733.68}}{2*2.7}=\frac{30-\sqrt{733.68}}{5.4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+\sqrt{733.68}}{2*2.7}=\frac{30+\sqrt{733.68}}{5.4}
$