x2-5=x+6.5

Solution for x2-5=x+6.5 equation:

x2-5=x+6.5

We move all terms to the left:

x2-5-(x+6.5)=0

We add all the numbers together, and all the variables

x^2-(x+6.5)-5=0

We get rid of parentheses

x^2-x-6.5-5=0

We add all the numbers together, and all the variables

x^2-1x-11.5=0

a = 1; b = -1; c = -11.5;
Δ = b2-4ac
Δ = -12-4·1·(-11.5)
Δ = 47
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{-(-1)-\sqrt{47}}{2*1}=\frac{1-\sqrt{47}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{47}}{2*1}=\frac{1+\sqrt{47}}{2}
$