f(x) = 2x + x³ - 4
f'(x) = 2(x)' + (x³)' - 4' = 2 * 1 + 3x² - 0 = 2 + 3x²
f'(4) = 2 + 3 * 4² = 2 + 48 = 50
ответ : f'(4) = 50
f(x) = 2x + x³ - 4
f'(x) = 2(x)' + (x³)' - 4' = 2 * 1 + 3x² - 0 = 2 + 3x²
f'(4) = 2 + 3 * 4² = 2 + 48 = 50
ответ : f'(4) = 50