Resumen

(x + 8) (x + 5) = x2 + x +
(x + 1) (x - 9) = x2 + x +
(x + 2) (x - 6) = x2 + x +
(x + 5) (x - 1) = x2 + x +
(x + 4) (x - 4) = x2 + x +
( 2x - 6 )2 = x2 + + x

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