Factorize each group, thenen use common factor method

Go ! $2a+2b + ca + cb= 2(a + b) + c(a+b) = (a + b)(2 + c)$ $(a + b)^2 + a + b =$ $(a + b)^2 + a^2 + ab =$ $x^3+2x^2+2x+1 =$