x2=x+39

Solution for x2=x+39 equation:

x2=x+39

We move all terms to the left:

x2-(x+39)=0

We add all the numbers together, and all the variables

x^2-(x+39)=0

We get rid of parentheses

x^2-x-39=0

We add all the numbers together, and all the variables

x^2-1x-39=0

a = 1; b = -1; c = -39;
Δ = b2-4ac
Δ = -12-4·1·(-39)
Δ = 157
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{-(-1)-\sqrt{157}}{2*1}=\frac{1-\sqrt{157}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{157}}{2*1}=\frac{1+\sqrt{157}}{2}
$