Exact value

**bigroo** · February 28th 2010, 06:30 AM

How do I show $sqrt(2/5)$ as an exact value?

Thanks

**e^(i*pi)** · February 28th 2010, 06:37 AM

Originally Posted by bigroo

How do I show $sqrt(2/5)$ as an exact value?

Thanks

That is an exact value.

$\sqrt{\frac{2}{5}} = \frac{\sqrt2}{\sqrt5}$

You can rationalise the denominator by multiplying by $\frac{\sqrt5}{\sqrt5}$

$\frac{\sqrt2}{\sqrt5} \cdot \frac{\sqrt5}{\sqrt5} = \frac{\sqrt{10}}{5}$

Although it's no more exact than the original expression

**bigroo** · February 28th 2010, 06:55 AM

Thanks for your help, I just wasn't sure if I could express it differently.

Thread: Exact value

LinkBack

Thread Tools

Display

Exact value

Similar Math Help Forum Discussions

transforming from a non-exact to an exact linear differential equation

to be exact or not exact? this is the question...

Why are exact ODEs called exact?

exact value

Exact value of sin

Search Tags