8k^2+4=484

Solution for 8k^2+4=484 equation:

8k^2+4=484

We move all terms to the left:

8k^2+4-(484)=0

We add all the numbers together, and all the variables

8k^2-480=0

a = 8; b = 0; c = -480;
Δ = b2-4ac
Δ = 02-4·8·(-480)
Δ = 15360
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$k_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$k_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{15360}=\sqrt{1024*15}=\sqrt{1024}*\sqrt{15}=32\sqrt{15}$
$k_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-32\sqrt{15}}{2*8}=\frac{0-32\sqrt{15}}{16}
=-\frac{32\sqrt{15}}{16}
=-2\sqrt{15}
$
$k_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+32\sqrt{15}}{2*8}=\frac{0+32\sqrt{15}}{16}
=\frac{32\sqrt{15}}{16}
=2\sqrt{15}
$