Solve the problem.
-For the function $f ( x ) = \sqrt { x ^ { 2 } - 9 x + 45 } - 1$, find all values $x$ for which $f ( x ) = 4$.
A) $\{ 5,4 \}$
B) $\{ 5 , - 4 \}$
C) $\{ - 5 , - 4 \}$
D) $\varnothing$

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The Answer of Solve the problem.
-For the function $f ( x ) = \sqrt { x ^ { 2 } - 9 x + 45 } - 1$, find all values $x$ for which $f ( x ) = 4$.
A) $\{ 5,4 \}$
B) $\{ 5 , - 4 \}$
C) $\{ - 5 , - 4 \}$
D) $\varnothing$

Solve the Problem f(x)=x2−9x+45−1f ( x ) = \sqrt { x ^ { 2 } - 9 x + 45 } - 1f(x)=x2−9x+45​−1

Solve the Problem $f ( x ) = \sqrt { x ^ { 2 } - 9 x + 45 } - 1$