64x^2-128=0

Solution for 64x^2-128=0 equation:

64x^2-128=0

a = 64; b = 0; c = -128;
Δ = b2-4ac
Δ = 02-4·64·(-128)
Δ = 32768
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:

$\sqrt{\Delta}=\sqrt{32768}=\sqrt{16384*2}=\sqrt{16384}*\sqrt{2}=128\sqrt{2}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-128\sqrt{2}}{2*64}=\frac{0-128\sqrt{2}}{128}
=-\frac{128\sqrt{2}}{128}
=-\sqrt{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+128\sqrt{2}}{2*64}=\frac{0+128\sqrt{2}}{128}
=\frac{128\sqrt{2}}{128}
=\sqrt{2}
$