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Recorda les IDENTITATS NOTABLES! Racionalitza i simplifica: * ( a + b ) 2 * ( a - b) 2 * ( a + b ) ( a - b) = = a2 a2 + b2 + b2 = a2 + - - 2ab 2ab b2 2 3 - 18 2 = - 2 3 + 12 2 = = + + 2 ( 3 1 - 5 ) = - + 5 3 - 2 = + 5 13 - 10 3 2 = - - 3 3 3 6 + + 2 2 2 = |