Resumen

(x + 3) (x + 1) = x2 + x +
(x + 9) (x + 3) = x2 + x +
(x + 7) (x + 8) = x2 + x +
(x + 4) (x - 3) = x2 + x +
(x + 6) (x - 1) = x2 + x +
(x + 1) (x - 3) = x2 + x +
( 4x + 3 )2 = x2 + + x
( x + 5 )2 = x2 + + x

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