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(x+4)(2x-1)=x(3x+11)

Răspuns :

x(2x-1)+4(2x-1)=3x²+11x
2x²-x+8x-4=3x²+11x
x²+4x+4=0
Δ=4²-4*4
Δ=0 => x₁=x₂=[tex] \frac{4}{2*1} [/tex]=2