134=5x+x^2

Solution for 134=5x+x^2 equation:

134=5x+x^2

We move all terms to the left:

134-(5x+x^2)=0

We get rid of parentheses

-x^2-5x+134=0

We add all the numbers together, and all the variables

-1x^2-5x+134=0

a = -1; b = -5; c = +134;
Δ = b2-4ac
Δ = -52-4·(-1)·134
Δ = 561
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{-(-5)-\sqrt{561}}{2*-1}=\frac{5-\sqrt{561}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{561}}{2*-1}=\frac{5+\sqrt{561}}{-2}
$