mohon dibantuuuuuuuuuuu

f(x) = (x³ - 1) (x⁴ + x²) (3x² - 5x)
      = (x⁷ + x⁵ - x⁴ - x²) (3x² - 5x)
      = (3x⁹ - 5x⁸ + 3x⁷ - 5x⁶ - 3x⁶ + 5x⁵ - 3x⁴ + 5x³)
      = 3x⁹ - 5x⁸ + 3x⁷ - 8x⁶ + 5x⁵ - 3x⁴ + 5x³

f'(x) = 27x⁸ - 40x⁷ + 21x⁶ - 48x⁵ + 25x⁴ - 12x³ + 15x²
f'(1) = 27 (1)⁸ - 40 (1)⁷ + 21 (1)⁶ - 48 (1)⁵ + 25 (1)⁴ - 12 (1)³ + 15 (1)²
       = 27 - 40 + 21 - 48 + 25 - 12 + 15
       = - 12        ( B )

semoga benar dan membantu ya