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2x(4x+2x+2)+4(2x+5x)=

Răspuns :

= 2x (6x + 2) + 4·7x = 12x² + 4x + 28 x = 12x² + 32x
=[tex] 8x^{2} +4 x^{2} +4x+8x+20x=12 x^{2} +32x[/tex]