Réitigh ∫ (2x+7)^3 wrt x

$$\int ( 2 x + 7 ) ^ { 3 } d x$$

Luacháil

$$\frac{\left(2x+7\right)^{4}}{8}+С$$

Céimeanna Réitigh

Úsáid an teoirim dhéthéarmach \left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} chun \left(2x+7\right)^{3} a leathnú.

$$\int 8x^{3}+84x^{2}+294x+343\mathrm{d}x$$

Measc an tsuim téarma fá téarma.

$$\int 8x^{3}\mathrm{d}x+\int 84x^{2}\mathrm{d}x+\int 294x\mathrm{d}x+\int 343\mathrm{d}x$$

Fág an leanúnach sna téarmaí as an áireamh.

$$8\int x^{3}\mathrm{d}x+84\int x^{2}\mathrm{d}x+294\int x\mathrm{d}x+\int 343\mathrm{d}x$$

Ó \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} fá choinne k\neq -1, athchuir \int x^{3}\mathrm{d}x le \frac{x^{4}}{4}. Méadaigh 8 faoi \frac{x^{4}}{4}.

$$2x^{4}+84\int x^{2}\mathrm{d}x+294\int x\mathrm{d}x+\int 343\mathrm{d}x$$

Ó \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} fá choinne k\neq -1, athchuir \int x^{2}\mathrm{d}x le \frac{x^{3}}{3}. Méadaigh 84 faoi \frac{x^{3}}{3}.

$$2x^{4}+28x^{3}+294\int x\mathrm{d}x+\int 343\mathrm{d}x$$

Ó \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} fá choinne k\neq -1, athchuir \int x\mathrm{d}x le \frac{x^{2}}{2}. Méadaigh 294 faoi \frac{x^{2}}{2}.

$$2x^{4}+28x^{3}+147x^{2}+\int 343\mathrm{d}x$$

Aimsigh suimeálaithe do 343 ag baint úsáid as an tábla do suimeálaithe coitianta riail\int a\mathrm{d}x=ax.

$$2x^{4}+28x^{3}+147x^{2}+343x$$

Má tá F\left(x\right) mar frithdhíorthach do f\left(x\right), beidh tacar do frithdhíorthach uile do f\left(x\right) a thabhairt ag F\left(x\right)+C. Mar sin de, cur an comhtháthú leanúnach C\in \mathrm{R} don toradh.

$$2x^{4}+28x^{3}+147x^{2}+343x+С$$

Difreálaigh w.r.t. x

$$\left(2x+7\right)^{3}$$