Differentiate function

**absvalue** · March 22nd 2010, 06:58 PM

the question im having trouble with is

$f(x) = \frac{\sqrt{5x}(1+x^2)}{\sqrt{2}}$

is there a simpler way than using the quotient rule? itried that, but ended up with a ridiculously long answer for the derivative.

**harish21** · March 22nd 2010, 07:05 PM

Originally Posted by absvalue

the question im having trouble with is

$f(x) = \frac{\sqrt{5x}(1+x^2)}{\sqrt{2}}$

is there a simpler way than using the quotient rule? itried that, but ended up with a ridiculously long answer for the derivative.

You are supposed to use the product rule here. $\frac{1}{\sqrt{2}}$ is a constant. So you have to find the derivative this way:

$\frac{1}{\sqrt{2}} \times \frac{d}{dx}\sqrt{5x}(1+x^2)$

or,

$\frac{\sqrt{5}}{\sqrt{2}} \times \frac{d}{dx}\sqrt{x}(1+x^2)$
Are you comfortable with the product rule. Try it and post if you have problems

**absvalue** · March 22nd 2010, 07:14 PM

ah

makes sense now. thanks!!

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