## College Algebra (11th Edition)

$(a - 3b - 3)^{2}$
Check factorization with FOIL and perfect squares rule: $(a - 3b - 3)^{2}$ = $((a - 3b) - 3)^{2}$ = $(a - 3b)^{2}$ + 2(a - 3b)(-3) + $(-3)^{2}$ = $(a - 3b)^{2}$ - 6(a - 3b) + 9