3x^2-8x=25

Solution for 3x^2-8x=25 equation:

3x^2-8x=25

We move all terms to the left:

3x^2-8x-(25)=0

a = 3; b = -8; c = -25;
Δ = b2-4ac
Δ = -82-4·3·(-25)
Δ = 364
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:

$\sqrt{\Delta}=\sqrt{364}=\sqrt{4*91}=\sqrt{4}*\sqrt{91}=2\sqrt{91}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-2\sqrt{91}}{2*3}=\frac{8-2\sqrt{91}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+2\sqrt{91}}{2*3}=\frac{8+2\sqrt{91}}{6}
$