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C) -8x^2+14x-3
D) 5a^2 -2a - 1
C. = 2x -8x² -3 + 12x = -8x² + 14x -3
D. = 15a² +3a -5a -1 = 15a² -2a -1
prosze bardzo ;)
C.(2x-3)(1-4x)= 2x - 8x² - 3 + 12x = 14x - 8x² - 3
D.(3a-1)(5a+1)= 15a² + 3a - 5a - 1 = 15a² - 2a - 1
:):)