u^2-10u+14=0

Solution for u^2-10u+14=0 equation:

u^2-10u+14=0

a = 1; b = -10; c = +14;
Δ = b2-4ac
Δ = -102-4·1·14
Δ = 44
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{44}=\sqrt{4*11}=\sqrt{4}*\sqrt{11}=2\sqrt{11}$
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{11}}{2*1}=\frac{10-2\sqrt{11}}{2}
$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{11}}{2*1}=\frac{10+2\sqrt{11}}{2}
$