(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hello. I have a problem with a innocent-looking integral:

[tex] \int\frac{x^2 + 7x + 12}{x + 4} dx [/tex]

It doesn't look like i can use the law of sines, because the numerator is of higher order than the denominator. It doesn't look like the numerator is a multiple of the denominator or vice versa. It doesn't look like I can split the relatively complex numerator to an useful product.

It looks like it relies on some high school level math for solving polynomials / fractions, but my math is rather rusty in some places and I can't seem to recall anything. I could look for the method if I knew its name. Sometimes it's best to ask a human being.

2. Relevant equations

It's from introductory examples, which means I'm not yet allowed to use:

- Integration by substitution

- Integration by parts

3. The attempt at a solution

[tex]\int\frac{x^2 + 7x + 12}{x + 4} dx = \int \frac{x^2}{x + 4} + \frac{7x}{x + 4} + \frac{12}{x + 4} dx =[/tex]

[tex]=\int \frac{x^2}{x + 4} + \frac{7x}{x + 4}dx + 12 \int \frac{dx}{x + 4} =[/tex]

[tex]= \int \frac{x^2}{x + 4} + \frac{7x}{x + 4}dx + 12 \ln |x + 4| + C_1[/tex]

No, I can't get very far.

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# Homework Help: Integral (x^2 + 7x + 12)/(x + 4)

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