Первообразная F(x) = ∫ (x² + 3) dx = (x³/3) + 3x + C, где C - константа интегрирования.
F(-2) = ((-2)³/3) + 3(-2) + C = (-8/3) - 6 + C
F(-2) = -8/3 - 18/3 + C = -26/3 + C
∫ (1 - 2x - 3x²) dx = x - x² - x³ + C, где C - константа интегрирования.
Результат: x - x² - x³ + C
3 - 2x + x² = 3
x² - 2x = 0
x(x - 2) = 0
x = 0 или x = 2
S = ∫[0, 2] (3 - (3 - 2x + x²)) dx = ∫[0, 2] (2x - x²) dx
∫[0, 2] (2x - x²) dx = [x² - (x³/3)][0, 2] = (2² - (2³/3)) - (0² - (0³/3)) = 4 - 8/3 = 12/3 - 8/3 = 4/3
F(x) = ∫ (4x² - x³) dx = (4x³/3) - (x⁴/4) + C, где C - константа интегрирования.
-2 = (4(-2)³/3) - ((-2)⁴/4) + C
-2 = (4(-8)/3) - (16/4) + C
-2 = -32/3 - 4 + C
C = -2 + 32/3 + 4 = 2 + 32/3 = 6/3 + 32/3 = 38/3
F(x) = (4x³/3) - (x⁴/4) + 38/3
S = ∫[-1, 1] (x³ + 3) dx
∫[-1, 1] (x³ + 3) dx = [(x⁴/4) + 3x][-1, 1] = ((1⁴/4) + 3(1)) - (((-1)⁴/4) + 3(-1)) = (1/4 + 3) - (1/4 - 3) = 1/4 + 3 - 1/4 + 3 = 6
Ответ:
1. F(x) = (x³/3) + 3x + C, F(-2) = -26/3 + C
2. x - x² - x³ + C
3. 4/3
4. F(x) = (4x³/3) - (x⁴/4) + 38/3
5. 6