2x2-30x+105=0

Solution for 2x2-30x+105=0 equation:

2x^2-30x+105=0

a = 2; b = -30; c = +105;
Δ = b2-4ac
Δ = -302-4·2·105
Δ = 60
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:

$\sqrt{\Delta}=\sqrt{60}=\sqrt{4*15}=\sqrt{4}*\sqrt{15}=2\sqrt{15}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-2\sqrt{15}}{2*2}=\frac{30-2\sqrt{15}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+2\sqrt{15}}{2*2}=\frac{30+2\sqrt{15}}{4}
$