Lets all do the maths laws: ( ) comes first, then the "times itself, this amount of times" (Sorry, don't know the english term for it), then times, then divided, then plus and then minus. If there is none of the last 4 infront of a ( ), then it is just a simple times, like the one in the video; 2(3) becomes: 2*3. Everything in a ( ) ALWAYS needs to be done as the first thing, and then the 6^2, which leads the correct answer following the laws of math, to be 10, as you first take the ( ) and then the 6^2 and then the 2*3 and then plus 4.