Tolong banget yaa no. 1-2 gimana caranya?
Jawab:
integral
∫ a xⁿ dx = a . 1/(n+1) x^(n+1) + c
Penjelasan dengan langkah-langkah:
1) ∫ ( x² – x – 3) dx =
= ∫ x² dx – ∫ x dx - 3∫ dx
= 1/3 x³ – 1/2 x² -3x + c
2) ∫ 4x³ ( x⁴ – 1)² dx =
i) cara langsung
= 4/4 . 1/(2+1) (x⁴ +1)²⁺¹ + c
= 1 . 1/3. (x⁴ +1) ³ + c
= 1/3 (x⁴ + 1)³ + c
ii) cara subs
u = x⁴ -1 –> du = 4x³ dx
4x³ dx = du
∫ 4x³ ( x⁴ – 1)² dx = ∫ du (u)²
= 1/3 u³ + c
= 1/3 (x⁴ -1 )³+ c
…