4b^2-6b=4

Solution for 4b^2-6b=4 equation:

4b^2-6b=4

We move all terms to the left:

4b^2-6b-(4)=0

a = 4; b = -6; c = -4;
Δ = b2-4ac
Δ = -62-4·4·(-4)
Δ = 100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{100}=10$
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-10}{2*4}=\frac{-4}{8}
=-1/2
$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+10}{2*4}=\frac{16}{8}
=2
$