0=x^2-5x+6x-30

Solution for 0=x^2-5x+6x-30 equation:

0=x^2-5x+6x-30

We move all terms to the left:

0-(x^2-5x+6x-30)=0

We add all the numbers together, and all the variables

-(x^2-5x+6x-30)=0

We get rid of parentheses

-x^2+5x-6x+30=0

We add all the numbers together, and all the variables

-1x^2-1x+30=0

a = -1; b = -1; c = +30;
Δ = b2-4ac
Δ = -12-4·(-1)·30
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{121}=11$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-11}{2*-1}=\frac{-10}{-2}
=+5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+11}{2*-1}=\frac{12}{-2}
=-6
$