Why does lua think this number is NaN? [Solved]

I was checking my understanding of what Magnitude is, and so far everything was going alright, but then I got this NaN error.

Furthermore, the equation for magnitude on a 3d Vector looks like this:

V = Vector

Vx, Vy, Vz = Vector components

||V|| = sqrt(Vx^2, Vy^2, Vz^2)

You can utilize this in Roblox with Vector3().Magnitude.

However, after applying negative numbers into a Vector3, I get this NaN error. Heres the code:

--3D Magnitude Equation;  ||V|| = ?(x^2 + y^2 + z^2)

local newVector =  Vector3.new(10, 10, 10)
print(newVector.Magnitude)

local magnitude3d = math.abs((math.sqrt((-10^2) + (-10^2) + (-10^2))))
print(magnitude3d)

17.320508956909

nan

However, if I change the components in magnitude3d to all be positive, the numbers come out as expected.

local newVector =  Vector3.new(10, 10, 10)
print(newVector.Magnitude)

local magnitude3d = math.abs((math.sqrt((10^2) + (10^2) + (10^2))))
print(magnitude3d)

17.320508956909

17.320508075689

This makes absolutely 0 sense to me at the moment. Math.abs() returns the absolute value of the number (it would always be positive). Also, if you square a number, the answer will always be positive, even if it's a negative number. I'm not quite understanding whats going on.

Another thing to be noted:

local newVector =  Vector3.new(-10, -10, -10)
print(newVector.Magnitude)

17.320508075689

Even if the components of a Vector3 are negative, it works here. So whats the deal? Is it because im taking the square root, or because i'm adding the squares of numbers together?

No idea. Thanks for anyone who knows enough about Lua to know why this error happens. And thanks if you even read this far, most people would be like, "Ew math" lol.