What is the u=sqrt(3-x) ?

The u=sqrt(3-x) is -1/(2sqrt(3-x))

What is the first u=sqrt(3-x) ?

The first u=sqrt(3-x) is -1/(2sqrt(3-x))

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\frac{d}{d x} (3 - x)

- \frac{1}{2 3 - x}

Solution steps

\frac{d}{d x} (3 - x)

Apply the chain rule:

\frac{1}{2 3 - x} \frac{d}{d x} (3 - x)

= \frac{1}{2 3 - x} \frac{d}{d x} (3 - x)

\frac{d}{d x} (3 - x) = - 1

= \frac{1}{2 3 - x} (- 1)

Simplify

= - \frac{1}{2 3 - x}