Resumen

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

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