# How did they do this?

No with this, but my algebra is terrible and I haven't had to use fractions properly for ages as I always usually convert to decimals.

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Mark44
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No with this, but my algebra is terrible
This isn't even algebra - it's arithmetic, and about 6th grade at that.
and I haven't had to use fractions properly for ages as I always usually convert to decimals.
Then it would behoove you to brush up on arithmetic involving fractions. Some time spent going through some videos at khanacademy (http://www.khanacademy.org/math/cc-sixth-grade-math) would be a very good investment.

No with this, but my algebra is terrible and I haven't had to use fractions properly for ages as I always usually convert to decimals.

That's just saying that $$\frac{1}{6}\int x^{-1/2}dx = \frac{1}{6}[2x^{1/2}]$$

You're aware of the generic formula: ##\int x^n dx = \frac{1}{n+1}x^{n+1}## right?