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c) (5-4x)(4x+5)+(4x-3) la a 2= ; d) (7x+2)(2-7x)+(6x-1) la a 2=

Răspuns :

[tex](5 - 4x)(5 + 4x) + (4x - 3) {}^{2} = 25 - 16x {}^{2} - 24x + 9 = 34 - 24x \\ \\(7x + 2)(7x - 2) + (6x - 1) {}^{2} = 49x { }^{2} - 4 + 36x {}^{2} - 12x + 1 = 13x { }^{2} - 12x[/tex]

Sper ca te-am ajutat! Succes!