2x^2-7x-47=0

Solution for 2x^2-7x-47=0 equation:

2x^2-7x-47=0

a = 2; b = -7; c = -47;
Δ = b2-4ac
Δ = -72-4·2·(-47)
Δ = 425
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:

$\sqrt{\Delta}=\sqrt{425}=\sqrt{25*17}=\sqrt{25}*\sqrt{17}=5\sqrt{17}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-5\sqrt{17}}{2*2}=\frac{7-5\sqrt{17}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+5\sqrt{17}}{2*2}=\frac{7+5\sqrt{17}}{4}
$