(6²-4x-3)(x-3)= (33-4x) *(x-3) = 33x - 99 -4x² - 12x = 21x +99 -4x²
(-3²-4x-5)(3x-1)= (9-4x-5) * (3x-1) = 27x + 9 -12x² + 4x - 15x + 5=
= 16x + 14 - 12x ²
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(6²-4x-3)(x-3)= (33-4x) *(x-3) = 33x - 99 -4x² - 12x = 21x +99 -4x²
(-3²-4x-5)(3x-1)= (9-4x-5) * (3x-1) = 27x + 9 -12x² + 4x - 15x + 5=
= 16x + 14 - 12x ²