Hi, please can someone watch this video here?
I can follow it right up to the part just before she takes the square root of both sides of the equation. What I don't get is the whole of the video before this point goes on about what you do to the left of the equation you have to do to the other side of the equation too. But in this section she has and but she only removes the m from the left hand side. Surely she should get rid of m from both sides to be consistent before going on to take the square roots of both sides of the equation?
Basically the question is why do the two m's on the right side of the equation not cancel out? It's rather amusing how they laugh heartily but make no effort to explain this.