# differentiate this please (1 Viewer)

#### Drongoski

##### Well-Known Member
$\bg_white \frac {d}{dx} \sqrt {\sqrt {x} - x}$

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#### Menomaths

##### Exaı̸̸̸̸̸̸̸̸lted Member
1/2sqrt(x) - 1

Are you testing us?

#### Drongoski

##### Well-Known Member
1/2sqrt(x) - 1

Are you testing us?
No - I actually got an answer very different from the book's. So I need help to resolve this. Should be very easy.

#### Menomaths

##### Exaı̸̸̸̸̸̸̸̸lted Member
No - I actually got an answer very different from the book's. So
Oh never mind you changed the question haha

#### HeroicPandas

##### Heroic!
i got $\bg_white \frac{1-2\sqrt{x}}{4\sqrt{x}\sqrt{\sqrt{x}-x}}$

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#### Drongoski

##### Well-Known Member
i got $\bg_white \frac{1-2\sqrt{x}}{4\sqrt{x}\sqrt{\sqrt{x}-x}} = \frac{1}{4}\cdot \frac{\sqrt{x}-2}{x^{\frac{5}{4}}\sqrt{1-\sqrt{x}}}$

$\bg_white \frac {3x^2(2-\sqrt x)}{2 (1-\sqrt x)^4}$

Maybe the book, just released last year, has not been fully debugged.

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