Determine all critical points for the function.
f(x)equalsStartFraction 4 x squared Over x plus 9 EndFraction
Question content area bottom
Part 1
A.
xequals9
B.
xequalsnegative 18 and xequals0
C.
xequals0 and xequalsnegative 9
D.
xequalsnegative 9
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