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x+3^2-1=3x-(x+5)(x-1)

Răspuns :

Răspuns:

x+9-1=3x-(x^2-x+5x-5)

x+8=3x-x^2+x-5x+5

x+8-3x+x^2-x+5x-5=0

x^2+2x+3=0

delta= b^2-4ac

delta= 4-4×1×3

delta=4-12=-8

x1= -b-rad delta/2a

x2=-b+rad delta/2a

x1= -2-2rad2/2

x2= -2+2rad2/2