Use $f ( x ) = x ^ { 2 } - 1$ and $g ( x ) = - \sqrt { x + 1 }$ to evaluate the expression $( f \circ g ) ( x )$ .
A) $- 1$
B) $- x ^ { 2 }$
C) $x ^ { 2 }$
D) $x$
E) $0$

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The Answer of Use $f ( x ) = x ^ { 2 } - 1$ and $g ( x ) = - \sqrt { x + 1 }$ to evaluate the expression $( f \circ g ) ( x )$ .
A) $- 1$
B) $- x ^ { 2 }$
C) $x ^ { 2 }$
D) $x$
E) $0$

Use f(x)=x2−1f ( x ) = x ^ { 2 } - 1f(x)=x2−1

Use $f ( x ) = x ^ { 2 } - 1$