7n^2-67-30=0

Solution for 7n^2-67-30=0 equation:

7n^2-67-30=0

We add all the numbers together, and all the variables

7n^2-97=0

a = 7; b = 0; c = -97;
Δ = b2-4ac
Δ = 02-4·7·(-97)
Δ = 2716
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:

$\sqrt{\Delta}=\sqrt{2716}=\sqrt{4*679}=\sqrt{4}*\sqrt{679}=2\sqrt{679}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{679}}{2*7}=\frac{0-2\sqrt{679}}{14}
=-\frac{2\sqrt{679}}{14}
=-\frac{\sqrt{679}}{7}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{679}}{2*7}=\frac{0+2\sqrt{679}}{14}
=\frac{2\sqrt{679}}{14}
=\frac{\sqrt{679}}{7}
$