Respuesta :

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Answer:

FOIL stands for multiply the first, outside, inside, and last terms together. When you FOIL a binomial times itself, the product is called a perfect square. For example, (a + b)2 gives you the perfect-square trinomial a2 + 2ab + b2.

Step-by-step explanation:
(a＋b)(a－b)＝a²－b²
(a＋b)(a＋b)＝(a＋b)²＝a²＋2ab＋b²
(a－b)(a－b)＝(a－b)²＝a²－2ab＋b²

Hope my answer helped u :)