What is the integral of x^3(5x^4+3)^2 ?

The integral of x^3(5x^4+3)^2 is (25x^{12}}{12}+\frac{15x^8)/4+(9x^4)/4+C

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integral of x^3(5x^4+3)^2

\int x^{3} (5 x^{4} + 3)^{2} d x

\frac{25 x ^{12}}{12} + \frac{15 x ^{8}}{4} + \frac{9 x ^{4}}{4} + C

Solution steps

\int x^{3} (5 x^{4} + 3)^{2} d x

Factor

5 x^{4} + 3 : - (- 5 x^{4} - 3)

= \int x^{3} (- (- 5 x^{4} - 3))^{2} d x

(- (- 5 x^{4} - 3))^{2} = (- 5 x^{4} - 3)^{2}

= \int x^{3} (- 5 x^{4} - 3)^{2} d x

- 5 x^{4} - 3 = 3 (- \frac{5 x ^{4}}{3} - 1)

= \int x^{3} (3 (- \frac{5 x ^{4}}{3} - 1))^{2} d x

Simplify

x^{3} (3 (- \frac{5 x ^{4}}{3} - 1))^{2} : 25 x^{11} + 30 x^{7} + 9 x^{3}

= \int 25 x^{11} + 30 x^{7} + 9 x^{3} d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int 25 x^{11} d x + \int 30 x^{7} d x + \int 9 x^{3} d x

\int 25 x^{11} d x = \frac{25 x ^{12}}{12}

\int 30 x^{7} d x = \frac{15 x ^{8}}{4}

\int 9 x^{3} d x = \frac{9 x ^{4}}{4}

= \frac{25 x ^{12}}{12} + \frac{15 x ^{8}}{4} + \frac{9 x ^{4}}{4}

Add a constant to the solution

= \frac{25 x ^{12}}{12} + \frac{15 x ^{8}}{4} + \frac{9 x ^{4}}{4} + C

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What is the integral of x^3(5x^4+3)^2 ?
The integral of x^3(5x^4+3)^2 is (25x^{12}}{12}+\frac{15x^8)/4+(9x^4)/4+C