-7n^2=-2

Solution for -7n^2=-2 equation:

-7n^2=-2

We move all terms to the left:

-7n^2-(-2)=0

We add all the numbers together, and all the variables

-7n^2+2=0

a = -7; b = 0; c = +2;
Δ = b2-4ac
Δ = 02-4·(-7)·2
Δ = 56
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{56}=\sqrt{4*14}=\sqrt{4}*\sqrt{14}=2\sqrt{14}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{14}}{2*-7}=\frac{0-2\sqrt{14}}{-14}
=-\frac{2\sqrt{14}}{-14}
=-\frac{\sqrt{14}}{-7}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{14}}{2*-7}=\frac{0+2\sqrt{14}}{-14}
=\frac{2\sqrt{14}}{-14}
=\frac{\sqrt{14}}{-7}
$