Répondre :
f(x) = (3x - 2)(-x + 4) - 3(2x - 1) - (2 - 3x)²
f(x) = (3x) * (-x) + (3x) * 4 + (-2) * (-x) + (-2) * 4 - [3 * (2x) - 3 * 1] - 2² - 2 * 2 * 3x + (3x)²
f(x) = -3x² + 12x + 2x - 8 - (6x - 3) - 4 - 12x + 9x²
f(x) = -3x² + 14x - 8 - 6x + 3 - 4 - 12x + 9x²
f(x) = 6x² - 4x - 9