Let $f ( x ) = \sqrt { x + 1 } , g ( x ) = x ^ { 2 } - 1$. Find the domain of the composite function. $( f \circ g ) ( x )$
A) $\quad ( - 1 , \infty )$
B) $\quad ( - \infty , - 1 ]$
C) $\quad ( - \infty , - 1 )$
D) $[ - 1 , \infty )$
E) $\quad ( - \infty , \infty )$

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The Answer of Let $f ( x ) = \sqrt { x + 1 } , g ( x ) = x ^ { 2 } - 1$. Find the domain of the composite function. $( f \circ g ) ( x )$
A) $\quad ( - 1 , \infty )$
B) $\quad ( - \infty , - 1 ]$
C) $\quad ( - \infty , - 1 )$
D) $[ - 1 , \infty )$
E) $\quad ( - \infty , \infty )$

Let f(x)=x+1,g(x)=x2−1f ( x ) = \sqrt { x + 1 } , g ( x ) = x ^ { 2 } - 1f(x)=x+1​,g(x)=x2−1

Let $f ( x ) = \sqrt { x + 1 } , g ( x ) = x ^ { 2 } - 1$