64x^2-40=0

Solution for 64x^2-40=0 equation:

64x^2-40=0

a = 64; b = 0; c = -40;
Δ = b2-4ac
Δ = 02-4·64·(-40)
Δ = 10240
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:

$\sqrt{\Delta}=\sqrt{10240}=\sqrt{1024*10}=\sqrt{1024}*\sqrt{10}=32\sqrt{10}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-32\sqrt{10}}{2*64}=\frac{0-32\sqrt{10}}{128}
=-\frac{32\sqrt{10}}{128}
=-\frac{\sqrt{10}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+32\sqrt{10}}{2*64}=\frac{0+32\sqrt{10}}{128}
=\frac{32\sqrt{10}}{128}
=\frac{\sqrt{10}}{4}
$