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a)x(x + 7) = 0
b)(x-1)(x+2)=0​


Răspuns :

a)x ori y=0=> ca x=0
si x+7=0
=>x1=0
x2=-7
b)(x-1)(x+2)=0 =>
x-1=0=>x1=1
x+2=0=>x=-2