G(x)=4x^2+2x-1

Solution for G(x)=4x^2+2x-1 equation:

(G)=4G^2+2G-1

We move all terms to the left:

(G)-(4G^2+2G-1)=0

We get rid of parentheses

-4G^2+G-2G+1=0

We add all the numbers together, and all the variables

-4G^2-1G+1=0

a = -4; b = -1; c = +1;
Δ = b2-4ac
Δ = -12-4·(-4)·1
Δ = 17
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$G_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$G_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$G_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-\sqrt{17}}{2*-4}=\frac{1-\sqrt{17}}{-8}
$
$G_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{17}}{2*-4}=\frac{1+\sqrt{17}}{-8}
$