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16(3x + 2) la a doua -9(2x-1)la a doua

Răspuns :

16(9x^2 + 12x + 4) - 9(4x^2 - 4x + 1) =
144x^2 + 192x + 64 - 36x^2 + 36x - 9 =
108x^2 + 228x + 55