3m^2+14m-1=0

Solution for 3m^2+14m-1=0 equation:

3m^2+14m-1=0

a = 3; b = 14; c = -1;
Δ = b2-4ac
Δ = 142-4·3·(-1)
Δ = 208
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{208}=\sqrt{16*13}=\sqrt{16}*\sqrt{13}=4\sqrt{13}$
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-4\sqrt{13}}{2*3}=\frac{-14-4\sqrt{13}}{6}
$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+4\sqrt{13}}{2*3}=\frac{-14+4\sqrt{13}}{6}
$