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Calculati: a) (4x + 3)(2x - 5) - (2x - 3)(3x + 7)
b) (x - 2)(x la puterea 2 - 3x + 4) - (2 - x la puterea 2)(2 - 3x) + (x + 3)(4x - 3)


Răspuns :

a) =[tex]8 x^{2} -20x+6x-15-6 x^{2} -14x+9x+21/\ \textless \ =\ \textgreater \ 2 x^{2} -19x+6[/tex]

b)=[tex] x^{3}-3 x^{2} +4x-2 x^{2} +6x-8-4+6x+2 x^{2} -3 x^{3}+ 4 x^{2} -3x+12 [/tex]<=>[tex]-2 x^{3} + x^{2} +25x-21[/tex]