X^2+x-9900=0

Solution for X^2+x-9900=0 equation:

X^2+X-9900=0

a = 1; b = 1; c = -9900;
Δ = b2-4ac
Δ = 12-4·1·(-9900)
Δ = 39601
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{39601}=199$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-199}{2*1}=\frac{-200}{2}
=-100
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+199}{2*1}=\frac{198}{2}
=99
$