a^2-2a=10

Solution for a^2-2a=10 equation:

a^2-2a=10

We move all terms to the left:

a^2-2a-(10)=0

a = 1; b = -2; c = -10;
Δ = b2-4ac
Δ = -22-4·1·(-10)
Δ = 44
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

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