4b^2+5b=1

Solution for 4b^2+5b=1 equation:

4b^2+5b=1

We move all terms to the left:

4b^2+5b-(1)=0

a = 4; b = 5; c = -1;
Δ = b2-4ac
Δ = 52-4·4·(-1)
Δ = 41
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-\sqrt{41}}{2*4}=\frac{-5-\sqrt{41}}{8}
$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{41}}{2*4}=\frac{-5+\sqrt{41}}{8}
$