Answer Key
803
2 x + h −
2 x
2 h h ≠ lim
b. lim
.
h
h →1 −
h →1 +
79 . a. x =1, b. x =2 81 . 0 83 . 2 x 3 85 . f ′( x ) =6 x +2
87 . f ′( x ) = − 1
(2 x ) 3/2
89 . f ′( x ) =3 x 2
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