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va rog repede

(3x+1)(3x+2)=56


Răspuns :

9x^2+6x+3x+2=56
9x^2+9x-54=0/:9
x^2+x+6=0
D(delta)=b^2-4ac
D=1+24
D=25
x1,x2=-b+-radical din delta/2a
x1,x2=-1+5/2
x1=2
x2=-3