4-10x=x2

Solution for 4-10x=x2 equation:

4-10x=x2

We move all terms to the left:

4-10x-(x2)=0

We add all the numbers together, and all the variables

-1x^2-10x+4=0

a = -1; b = -10; c = +4;
Δ = b2-4ac
Δ = -102-4·(-1)·4
Δ = 116
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:

$\sqrt{\Delta}=\sqrt{116}=\sqrt{4*29}=\sqrt{4}*\sqrt{29}=2\sqrt{29}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{29}}{2*-1}=\frac{10-2\sqrt{29}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{29}}{2*-1}=\frac{10+2\sqrt{29}}{-2}
$