2m(p-q)x+3(p-q)
=(p-q)(2mx+3) ←共通因数でくくる

(x-2)**2+2(2-x)が(x-2)^2+2(2-x)のことなら
(x-2)^2+2(2-x)
=(x-2)^2-2(x-2)
=(x-2)(x-2-2) 
=(x-2)(x-4)