Help with part "c" please..

3. Suppose f(x) = x? - 2x, a . *-3 Compute [()-143) Simplify your answer. f ( x ) - f ( 3 ) X - 3 f ( 3 ) = 3 2 - 2 x 3 = 9- 6= 3 F ( x ) - f (3 ) = * 2 - 2 x - 3 X - 3 X - 3 -X - - 3x + X-> , * ( x 3 ) + 1 (x - 3 )_ (* * 3 ) (* + 1) x - B X - 3 *+1 h b. Computer (*+*)-16 Simplify your answer. f ( x +h) = ( xth) ' - a(xth) = x2+2hxth2-2x-26732 = h2+ 2h (x -1 ) 3 to (h+ 2 ( x - 1 ) ) h = (h+ 2x+ 2:-1) h both+ 2x- 2 = h + 2 x - 2 C. Graphically, what is the meaning of your answer to both a) and b)