I kept on answering my teacher’s questions about this. She got shocked. And asked me, “do you have another math teacher? Do you tutor?” And I answered. “Yes.” She backfired with “who?” Me: Sir. Brian McLogan
example 3 is off, it has to be (x+4)(x-1). at first i thought i was wrong but i tried it with the +3 and it obviously didn't work but this video is still very helpful !