Sorry. I wrote that wrong, the RHS is 100.
I didn't square the whole left hand side, I separately squared each term, if that makes sense.
So, after squaring, I had 2x+20+2x=100
I can see that you squared the whole LHS. Why? In my mind it seems like squaring each term separately should yield the same results.
Thank you for your help, by the way!
Okay, if I square the whole LHS, I FOIL the terms, simplify and end up with:
but I still have that nasty square root sign. Which is why I squared everything to begin with. To get rid of the square roots so I could solve for x nicely.