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simplificati( 2- x)(2+x ) + (x + 3)² - 4(x+3) unde x E R
VA ROGGG​


Răspuns :

(2 - x)(2 + x ) + (x + 3)² - 4(x + 3) =

= 4 - x² + x² + 6x + 9 - 4x - 12

= 1 + 2x