(x-1)•(x-1)
(x-3)²+(x+2)²


Răspuns :

a) x la a doua -x-x+1=x la a doua -2x +1
b) x la a doua -6x+9+x la a doua +4x+4=2x la a doua -2x+13
(x-1)(x+1)=x²-1

(x-3)²+(x+2)²=x²-6x+9+x²+4x+4=2x²-2x+13