2*x*x+4*x-60=0

Solution for 2*x*x+4*x-60=0 equation:

2x*x+4x-60=0

We add all the numbers together, and all the variables

4x+2x*x-60=0

Wy multiply elements

2x^2+4x-60=0

a = 2; b = 4; c = -60;
Δ = b2-4ac
Δ = 42-4·2·(-60)
Δ = 496
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:

$\sqrt{\Delta}=\sqrt{496}=\sqrt{16*31}=\sqrt{16}*\sqrt{31}=4\sqrt{31}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{31}}{2*2}=\frac{-4-4\sqrt{31}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{31}}{2*2}=\frac{-4+4\sqrt{31}}{4}
$