2.(a+b)? +2(a+b)+ 1=(a+b)? +2(a+b)+ 1? (collocation method) =[(a+b)+ 1]? =(a+b+ 1)?
The fourth power of 3.4x-the third power of 4x+x? =x? (4x? -4x+ 1) (re-matching method) =x? (2x- 1)?
4.x? - 16ax+64a? (or matching method) =(x-8a)?
5.(x- 1)(x-3)+ 1 (left parenthesis) =x? -4x+3= 1=x? -4x+4 (how to always match methods) =(x-2)?
6.(ab+a)+(b+ 1) (open bracket) =a+b+ab+ 1 (using double cross multiplication) =(a+ 1)(b+ 1).