s2+21s-22=0

Solution for s2+21s-22=0 equation:

s2+21s-22=0

We add all the numbers together, and all the variables

s^2+21s-22=0

a = 1; b = 21; c = -22;
Δ = b2-4ac
Δ = 212-4·1·(-22)
Δ = 529
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{529}=23$
$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(21)-23}{2*1}=\frac{-44}{2}
=-22
$
$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(21)+23}{2*1}=\frac{2}{2}
=1
$