f ( x ) = ( 3 x + 12 ( ) x − 2 ) ( x − 1 ) ( x + 5 ) {\displaystyle f(x)=\frac{(3x+12()x-2)}{(x-1)(x+5)} }
f ( x ) = ( x 2 − 9 ) ( x − 3 ) {\displaystyle f(x)=\frac{(x^2-9)}{(x-3)} }
f ( x ) = ( x − 3 ) ( x 2 − 9 ) {\displaystyle f(x)=\frac{(x-3)}{(x^2-9)} }
f ( x ) = ( x 2 + 4 x ( x 2 − 16 ) {\displaystyle f(x)=\frac{(x^2+4x}{(x^2-16)} }