4x^2-3.1=1.9-12x

Solution for 4x^2-3.1=1.9-12x equation:

4x^2-3.1=1.9-12x

We move all terms to the left:

4x^2-3.1-(1.9-12x)=0

We add all the numbers together, and all the variables

4x^2-(-12x+1.9)-3.1=0

We get rid of parentheses

4x^2+12x-1.9-3.1=0

We add all the numbers together, and all the variables

4x^2+12x-5=0

a = 4; b = 12; c = -5;
Δ = b2-4ac
Δ = 122-4·4·(-5)
Δ = 224
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{224}=\sqrt{16*14}=\sqrt{16}*\sqrt{14}=4\sqrt{14}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-4\sqrt{14}}{2*4}=\frac{-12-4\sqrt{14}}{8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+4\sqrt{14}}{2*4}=\frac{-12+4\sqrt{14}}{8}
$