x2-11x-40=0

Solution for x2-11x-40=0 equation:

x2-11x-40=0

We add all the numbers together, and all the variables

x^2-11x-40=0

a = 1; b = -11; c = -40;
Δ = b2-4ac
Δ = -112-4·1·(-40)
Δ = 281
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-11)-\sqrt{281}}{2*1}=\frac{11-\sqrt{281}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+\sqrt{281}}{2*1}=\frac{11+\sqrt{281}}{2}
$