x^2-9999999999x-10000000000=0

Solution for x^2-9999999999x-10000000000=0 equation:

x^2-9999999999x-10000000000=0

a = 1; b = -9999999999; c = -10000000000;
Δ = b2-4ac
Δ = -99999999992-4·1·(-10000000000)
Δ = 1.0000000002E+20
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1.0000000002E+20}=10000000001$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9999999999)-10000000001}{2*1}=\frac{-2}{2}
=-1
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9999999999)+10000000001}{2*1}=\frac{20000000000}{2}
=10000000000
$