x2-31x+225=0

Solution for x2-31x+225=0 equation:

x2-31x+225=0

We add all the numbers together, and all the variables

x^2-31x+225=0

a = 1; b = -31; c = +225;
Δ = b2-4ac
Δ = -312-4·1·225
Δ = 61
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{-(-31)-\sqrt{61}}{2*1}=\frac{31-\sqrt{61}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-31)+\sqrt{61}}{2*1}=\frac{31+\sqrt{61}}{2}
$