X2-20x-736=0

Solution for X2-20x-736=0 equation:

X2-20X-736=0

We add all the numbers together, and all the variables

X^2-20X-736=0

a = 1; b = -20; c = -736;
Δ = b2-4ac
Δ = -202-4·1·(-736)
Δ = 3344
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{3344}=\sqrt{16*209}=\sqrt{16}*\sqrt{209}=4\sqrt{209}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-4\sqrt{209}}{2*1}=\frac{20-4\sqrt{209}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+4\sqrt{209}}{2*1}=\frac{20+4\sqrt{209}}{2}
$