Solve this: 17 .   I f   f ( x )   i s   c o n t i n o u s   a t   x = 0   , f i n d   t h e   v a l u e   o f   a   a n d   k f x   = 1 - 1 - 4 x x 7 x 2 - 8 x + 14 a log ( 1 + 7 x ) 5 x   X > 0   , X = 0 , X < 0  

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