Resumen

(x + 6) (x + 2) = x2 + x +
(x + 3) (x + 7) = x2 + x +
(x + 5) (x - 7) = x2 + x +
(x + 1) (x - 6) = x2 + x +
(x + 7) (x - 7) = x2 + x +
( 5x + 4 )2 = x2 + + x
( 3x - 3 )2 = x2 + + x
( 2x - 1 )2 = x2 + + x

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