2x^2+14x-697=0

Solution for 2x^2+14x-697=0 equation:

2x^2+14x-697=0

a = 2; b = 14; c = -697;
Δ = b2-4ac
Δ = 142-4·2·(-697)
Δ = 5772
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:

$\sqrt{\Delta}=\sqrt{5772}=\sqrt{4*1443}=\sqrt{4}*\sqrt{1443}=2\sqrt{1443}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-2\sqrt{1443}}{2*2}=\frac{-14-2\sqrt{1443}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+2\sqrt{1443}}{2*2}=\frac{-14+2\sqrt{1443}}{4}
$