Answer
$u=(x+1).$
$y=u^{-\frac{1}{2}}=\dfrac{1}{\sqrt{u}}$
Work Step by Step
Working from the inside out:
Take $x$; add $1$ to it $\leftarrow$ "inner function."
Take $(x+1)$; raise it the power of $-\dfrac{1}{2}\leftarrow$ "outer function".
$u=(x+1).$
$y=u^{-\frac{1}{2}}=\dfrac{1}{\sqrt{u}}$
