Question 486174
You could just write it twice and use FOIL (distribution rules).
The quicker way for this special case is the FOOL method (i just made that up = hope I'm the first):
F: square the first quant w --> w^2
OO: 2 * the cross product W * -2 --> -4w
L: square the last quant -2 --> +4
(w-2)^2 = w^2 -4w +4