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Help me, please! I don't know it.
(x+√2)²-8


Răspuns :

(x+√2)²-8 = (x+√2)²    - ( 2√2)²   = ( x + √2  + 2√2) · ( x + √2 - 2√2)= 
 = ( x + 3√2 ) ·( x - √2)
sau = x² +2√2x - 6