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Calculati:
a) (x+1)² - (x-1)²
b) (2x+3y)(2x-3y) + 9y²
c) Forma restransa a numarului x² - 4x + 4.


Răspuns :

a)=x²+2x+1-x²-2x+1 
b)=4x²-9y²+9y²
 c)(x-2)²
a) (x+1)²-(x-1)²= x²+2x+1-x²-2x+1=2 B)(2x+3y)(2x-3y)+9x²=4x²-9y²+9x²= 13x²-9y² C) nu mai stiu...scuzeee:(