3x^2+60x-200=0

Solution for 3x^2+60x-200=0 equation:

3x^2+60x-200=0

a = 3; b = 60; c = -200;
Δ = b2-4ac
Δ = 602-4·3·(-200)
Δ = 6000
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:

$\sqrt{\Delta}=\sqrt{6000}=\sqrt{400*15}=\sqrt{400}*\sqrt{15}=20\sqrt{15}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(60)-20\sqrt{15}}{2*3}=\frac{-60-20\sqrt{15}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(60)+20\sqrt{15}}{2*3}=\frac{-60+20\sqrt{15}}{6}
$