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se considera multimea numerelor reale R pe care se defineste legea x*y=4xy -4x-4y +5 , verificati daca x*y=4(x-1)(y-1)+1 URGENTTT

Răspuns :

x*y = 4xy -4x-4y+5

= 4xy -4x -4y + 4+1

= 4x(y-1) - 4(y-1)+1

= (y-1)(4x-4)+1

= 4(x-1)(y-1)+1