8x2-100=0

Solution for 8x2-100=0 equation:

8x^2-100=0

a = 8; b = 0; c = -100;
Δ = b2-4ac
Δ = 02-4·8·(-100)
Δ = 3200
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:

$\sqrt{\Delta}=\sqrt{3200}=\sqrt{1600*2}=\sqrt{1600}*\sqrt{2}=40\sqrt{2}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-40\sqrt{2}}{2*8}=\frac{0-40\sqrt{2}}{16}
=-\frac{40\sqrt{2}}{16}
=-\frac{5\sqrt{2}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+40\sqrt{2}}{2*8}=\frac{0+40\sqrt{2}}{16}
=\frac{40\sqrt{2}}{16}
=\frac{5\sqrt{2}}{2}
$