0=x^2+24x+60

Solution for 0=x^2+24x+60 equation:

0=x^2+24x+60

We move all terms to the left:

0-(x^2+24x+60)=0

We add all the numbers together, and all the variables

-(x^2+24x+60)=0

We get rid of parentheses

-x^2-24x-60=0

We add all the numbers together, and all the variables

-1x^2-24x-60=0

a = -1; b = -24; c = -60;
Δ = b2-4ac
Δ = -242-4·(-1)·(-60)
Δ = 336
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:

$\sqrt{\Delta}=\sqrt{336}=\sqrt{16*21}=\sqrt{16}*\sqrt{21}=4\sqrt{21}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-24)-4\sqrt{21}}{2*-1}=\frac{24-4\sqrt{21}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-24)+4\sqrt{21}}{2*-1}=\frac{24+4\sqrt{21}}{-2}
$