Resumen

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

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