2x^2-30x+63=0

Solution for 2x^2-30x+63=0 equation:

2x^2-30x+63=0

a = 2; b = -30; c = +63;
Δ = b2-4ac
Δ = -302-4·2·63
Δ = 396
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:

$\sqrt{\Delta}=\sqrt{396}=\sqrt{36*11}=\sqrt{36}*\sqrt{11}=6\sqrt{11}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-6\sqrt{11}}{2*2}=\frac{30-6\sqrt{11}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+6\sqrt{11}}{2*2}=\frac{30+6\sqrt{11}}{4}
$