Solve the Inequality $f ( x ) = x ^ { 2 } - 2 x - 35$

Solve the inequality.
-For the function $f ( x ) = x ^ { 2 } - 2 x - 35$ , solve $f ( x ) \leq 0$ .

A) $( - \infty , - 5 ] \cup [ 7 , \infty )$
B) $[ - 5,7 ]$
C) $( - \infty , - 5 ]$
D) $[ 7 , \infty )$

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