-1=x^2+5x

Solution for -1=x^2+5x equation:

-1=x^2+5x

We move all terms to the left:

-1-(x^2+5x)=0

We get rid of parentheses

-x^2-5x-1=0

We add all the numbers together, and all the variables

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

a = -1; b = -5; c = -1;
Δ = b2-4ac
Δ = -52-4·(-1)·(-1)
Δ = 21
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{21}}{2*-1}=\frac{5-\sqrt{21}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{21}}{2*-1}=\frac{5+\sqrt{21}}{-2}
$