2x2+13x=11

Solution for 2x2+13x=11 equation:

2x^2+13x=11

We move all terms to the left:

2x^2+13x-(11)=0

a = 2; b = 13; c = -11;
Δ = b2-4ac
Δ = 132-4·2·(-11)
Δ = 257
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{-(13)-\sqrt{257}}{2*2}=\frac{-13-\sqrt{257}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+\sqrt{257}}{2*2}=\frac{-13+\sqrt{257}}{4}
$