Respuesta:
[tex](x + a)(x - b) = {x}^{2} - bx + ax - ab \\ {x}^{2} + (a - b)x - ab \\ donde \: a = b \\ {x}^{2} - {a}^{2} \\ o \: bien \\ {x}^{2} - {b}^{2} [/tex]
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Respuesta:
[tex](x + a)(x - b) = {x}^{2} - bx + ax - ab \\ {x}^{2} + (a - b)x - ab \\ donde \: a = b \\ {x}^{2} - {a}^{2} \\ o \: bien \\ {x}^{2} - {b}^{2} [/tex]