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restringeti in patrate
A) a2 +2ay; B) b2+c2 -bc ; C) 2xz+z2+x2 ; D)9-6y+y2 ;.

a2 =doi la patrat


Răspuns :

a²+2ay=a(a+2y)

b²+c²-bc=nu se poate restrange numai daca era b²+c²-2bc=(b-c)²

2xz+z²+z²=(x+z)²

9-6y+y²=(y-3)²