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(a+b)(a+c) = a^2 + a(b+c) + b(c)
(a-b)(a-c) = a^2 - a(b+c) + b(c)
(a+b)(a-c) = a^2 + a(b-c) + b(-c)
(a-b)(a+c) = a^2 + a(-b+c) + (-b)c
Un ejemplo: (X+8)(X-7)
(X+8)(X-7) = X^2 + X(8-7) + 8(-7)
= X^2 + X(1) - 56
= X^2 + X - 56