A friend and I are having a debate about this over Skype. I saw it on Facebook and can't figure out if it's an imaginary number or real. If all else fails, ask MR community. My logic behind it is that no matter what, there's a negative under a square root, forcing it to be imaginary. Everything else is a distraction due to PEMDAS. Therefore, must be imaginary, yes? My friend is arguing that it's real because the ^2 cancels out the square root and a negative * negative is a positive, making it real. Which is it?