12x^2+48x-18=0

Solution for 12x^2+48x-18=0 equation:

12x^2+48x-18=0

a = 12; b = 48; c = -18;
Δ = b2-4ac
Δ = 482-4·12·(-18)
Δ = 3168
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:

$\sqrt{\Delta}=\sqrt{3168}=\sqrt{144*22}=\sqrt{144}*\sqrt{22}=12\sqrt{22}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(48)-12\sqrt{22}}{2*12}=\frac{-48-12\sqrt{22}}{24}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(48)+12\sqrt{22}}{2*12}=\frac{-48+12\sqrt{22}}{24}
$