Find the Derivative Of $f ( x ) = 7 x ^ { 2 } - 9 x + 4$

Multiple Choice

Find the derivative of $f ( x ) = 7 x ^ { 2 } - 9 x + 4$ .

A) $14 x - 9$
B) $7 x - 9$
C) $14 x - 5$
D) $7 x - 5$
E) $14 x$