x^2-39x-1260=0

Solution for x^2-39x-1260=0 equation:

x^2-39x-1260=0

a = 1; b = -39; c = -1260;
Δ = b2-4ac
Δ = -392-4·1·(-1260)
Δ = 6561
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{6561}=81$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-39)-81}{2*1}=\frac{-42}{2}
=-21
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-39)+81}{2*1}=\frac{120}{2}
=60
$