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(3x-4) (3x+4) rezolvare ??

Răspuns :

[tex](3x-4)(3x+4)=\ \textgreater \ (3 x)^{2} - 4^{2} =\ \textgreater \ 9 x^{2} -16[/tex]
[tex]Succes.[/tex]
(3x-4)(3x+4) = 3²x²+3x*4-4*3x-4*4 = 9x²+12x-12x-16 = 9x²-16