Whenever you have perfect squares and a difference. You know their won’t have any middle piece to the polynomial. You will get conjugates. So you know you can multiply the two variables together and the units.

What I didn’t understand about this was you had to follow the “instructions” (the equation) like a book. You can’t skip a step nor rip a page out o the book you must read it. When it says there is 2 copies of the term then you must follow it and that you multiply it by 5 you must multiply the equation by 5.