∫ x(x+5)^3 wrt x eching

$$\int x ( x + 5 ) ^ { 3 } d x$$

Baholash

$$\frac{x^{5}}{5}+\frac{15x^{4}}{4}+25x^{3}+\frac{125x^{2}}{2}+С$$

Yechim qadamlari

\left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} binom teoremasini \left(x+5\right)^{3} kengaytirilishi uchun ishlating.

$$\int x\left(x^{3}+15x^{2}+75x+125\right)\mathrm{d}x$$

x ga x^{3}+15x^{2}+75x+125 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.

$$\int x^{4}+15x^{3}+75x^{2}+125x\mathrm{d}x$$

Summani muddatma-muddat integratsiya qiling.

$$\int x^{4}\mathrm{d}x+\int 15x^{3}\mathrm{d}x+\int 75x^{2}\mathrm{d}x+\int 125x\mathrm{d}x$$

Har bir shartda konstantani qavsdan tashqariga oling.

$$\int x^{4}\mathrm{d}x+15\int x^{3}\mathrm{d}x+75\int x^{2}\mathrm{d}x+125\int x\mathrm{d}x$$

k\neq -1 uchun integral \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} boʻlgani uchun, \int x^{4}\mathrm{d}x integralni \frac{x^{5}}{5} bilan almashtiring.

$$\frac{x^{5}}{5}+15\int x^{3}\mathrm{d}x+75\int x^{2}\mathrm{d}x+125\int x\mathrm{d}x$$

k\neq -1 uchun integral \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} boʻlgani uchun, \int x^{3}\mathrm{d}x integralni \frac{x^{4}}{4} bilan almashtiring. 15 ni \frac{x^{4}}{4} marotabaga ko'paytirish.

$$\frac{x^{5}}{5}+\frac{15x^{4}}{4}+75\int x^{2}\mathrm{d}x+125\int x\mathrm{d}x$$

k\neq -1 uchun integral \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} boʻlgani uchun, \int x^{2}\mathrm{d}x integralni \frac{x^{3}}{3} bilan almashtiring. 75 ni \frac{x^{3}}{3} marotabaga ko'paytirish.

$$\frac{x^{5}}{5}+\frac{15x^{4}}{4}+25x^{3}+125\int x\mathrm{d}x$$

k\neq -1 uchun integral \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} boʻlgani uchun, \int x\mathrm{d}x integralni \frac{x^{2}}{2} bilan almashtiring. 125 ni \frac{x^{2}}{2} marotabaga ko'paytirish.

$$\frac{x^{5}}{5}+\frac{15x^{4}}{4}+25x^{3}+\frac{125x^{2}}{2}$$

Qisqartirish.

$$\frac{125x^{2}}{2}+25x^{3}+\frac{15x^{4}}{4}+\frac{x^{5}}{5}$$

Агар F\left(x\right)f\left(x\right) ning dastlabki holati boʻlsa, u holatda f\left(x\right) ning barcha dastlabki holatlari toʻplami F\left(x\right)+C tarafidan belgilanadi. Shu sababli natijaga C\in \mathrm{R} integrallash konstantasini qoʻshing.

$$\frac{125x^{2}}{2}+25x^{3}+\frac{15x^{4}}{4}+\frac{x^{5}}{5}+С$$

x ga nisbatan hosilani topish

$$x\left(x+5\right)^{3}$$