csat-suneung 2018 Q18

csat-suneung · South-Korea · csat__math-humanities 4 marks Stationary points and optimisation Determine parameters from given extremum conditions
A cubic function $f ( x )$ with leading coefficient 1 and $f ( 1 ) = 0$ satisfies $$\lim _ { x \rightarrow 2 } \frac { f ( x ) } { ( x - 2 ) \left\{ f ^ { \prime } ( x ) \right\} ^ { 2 } } = \frac { 1 } { 4 }$$ Find the value of $f ( 3 )$. [4 points]
(1) 4
(2) 6
(3) 8
(4) 10
(5) 12
A cubic function $f ( x )$ with leading coefficient 1 and $f ( 1 ) = 0$ satisfies
$$\lim _ { x \rightarrow 2 } \frac { f ( x ) } { ( x - 2 ) \left\{ f ^ { \prime } ( x ) \right\} ^ { 2 } } = \frac { 1 } { 4 }$$
Find the value of $f ( 3 )$. [4 points]\\
(1) 4\\
(2) 6\\
(3) 8\\
(4) 10\\
(5) 12