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rog simplifică (2x-3) la puterea2 -(2x-3)(2x+3)

Răspuns :

Răspuns

[tex](2x-3)^2-(2x-3)(2x+3)=\\4x^2-12x+9-4x^2+9=-12x+18 =-6(2x-3)\\Am~aplicat~formulele:\\\bullet (a\pm b)^2=a^2\pm 2ab+b^2\\\bullet (a+b)(a-b) = a^2-b^2[/tex]