What is the integral of (9x^2+1)ln(x) ?

The integral of (9x^2+1)ln(x) is 3x^3ln(x)-x^3+xln(x)-x+C

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integral of (9x^2+1)ln(x)

\int (9 x^{2} + 1) ln (x) d x

3 x^{3} ln (x) - x^{3} + x ln (x) - x + C

Solution steps

\int (9 x^{2} + 1) ln (x) d x

Expand

(9 x^{2} + 1) ln (x) : 9 x^{2} ln (x) + ln (x)

= \int 9 x^{2} ln (x) + ln (x) 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 9 x^{2} ln (x) d x + \int ln (x) d x

\int 9 x^{2} ln (x) d x = 3 x^{3} ln (x) - x^{3}

\int ln (x) d x = x ln (x) - x

= 3 x^{3} ln (x) - x^{3} + x ln (x) - x

Add a constant to the solution

= 3 x^{3} ln (x) - x^{3} + x ln (x) - x + C

What is the integral of (9x^2+1)ln(x) ?
The integral of (9x^2+1)ln(x) is 3x^3ln(x)-x^3+xln(x)-x+C