Differentiate $y = \dfrac{2}{(x + 1)}$

The correct answer is $\dfrac{-2}{(x + 1)^2}$

Using the Quotient rule

$y'$ = $\dfrac{(x + 1) D(2) - (2) D(x + 1)}{(x + 1)^2}$
$y'$ = $\dfrac{(x + 1) 0 - (2)(1)}{(x + 1)^2}$
$y'$ = $\dfrac{-2}{(x + 1)^2}$