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Hello, i am experiencing all kinds of confusion as far as FOIL goes. I understand the concept, and I got the first bunch of questions right aka (x - 7) (x + 10) x^2 + 10x - 7X + 70 x^2 + 3x + 70 but then I am encountering ones like (3r + 9) (2r - 1) and i did (3r + 9) (2r - 1) 6r^2 + 3r -...