2x2+12x=25

Solution for 2x2+12x=25 equation:

2x^2+12x=25

We move all terms to the left:

2x^2+12x-(25)=0

a = 2; b = 12; c = -25;
Δ = b2-4ac
Δ = 122-4·2·(-25)
Δ = 344
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:

$\sqrt{\Delta}=\sqrt{344}=\sqrt{4*86}=\sqrt{4}*\sqrt{86}=2\sqrt{86}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-2\sqrt{86}}{2*2}=\frac{-12-2\sqrt{86}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+2\sqrt{86}}{2*2}=\frac{-12+2\sqrt{86}}{4}
$