2.1 The Derivative Objective: Find the slope of the
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Transcript 2.1 The Derivative Objective: Find the slope of the
Miss Battaglia
BC Calculus
Given a point, P, we want to define
and calculate the slope of the
line tangent to the graph at P.
ď˝
Definition of Tangent Line with Slope m
If f is defined on an open interval containing c, and
if the limit
âđŚ
đ đ + âđĽ â đ(đ)
lim
= lim
=đ
âđĽâ0 âđĽ
âđĽâ0
âđĽ
exists, then the line passing through (c, f(c)) with
slope m is the tangent line to the graph of f at the
point (c,f(c)).
Find the slope of the graph of f(x)=2x-3 at
the point (2,1)
đ đ + âđĽ â đ(đ)
lim
âđĽâ0
âđĽ
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Find the slope of the graph of f(x)=3-5x at
the point (-1,8)
đ đ + âđĽ â đ(đ)
lim
âđĽâ0
âđĽ
ď˝
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Find the slope of the graph of đ đĽ = đĽ 2 + 1 at the point
(0,1) and (-1,2)
đ đ + âđĽ â đ(đ)
lim
âđĽâ0
âđĽ
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Find the slope of the graph of đ đĽ = đĽ 2 â 9 at the point
(2,-5)
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The derivative measures the steepness of the
graph of a function at some particular point
on the graph. Thus, the derivative is a slope.
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The derivative of f at x is given by
đ đĽ + âđĽ â đ(đĽ)
đĽ = lim
âđĽâ0
âđĽ
provided the limit exists. For all x for which this limit
exists, fâ is a function of x.
đâ˛
Notations: fâ(x),
đđŚ
,
đđĽ
yâ,
đ
[đ
đđĽ
đĽ ], đˇđĽ [đŚ]
(they all mean the same thing!)
ď˝
đâ˛
Find the derivative of đ đĽ = đĽ 3 + 2đĽ
đ đĽ + âđĽ â đ(đĽ)
đĽ = lim
âđĽâ0
âđĽ
ď˝
đâ˛
Find the derivative of đ đĽ = 8
đ đĽ + âđĽ â đ(đĽ)
đĽ = lim
âđĽâ0
âđĽ
1
â đĽ
5
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Find fâ(x) for đ đĽ = đĽ. Then find the slopes of the graph
of f at the points (1,1) and (4,2). Discuss the behavior of f
at (0,0).
ď˝
đ
(a) Find an equation of the tangent line to the graph of the equation at a
given point. (b) Use a graphing utility to graph the function and its tangent
line at the point and (c) Use the derivative feature of a graphing utility to
confirm your results
đĽ = đĽ 2 + 3đĽ + 4 (-2,2)
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Find the derivative with respect to t for the function đŚ =
2
đĄ
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The limit represents fâ(c) for a function f and a number c.
Find f and c.
5 â 3 1 + âđĽ
lim
âđĽâ0
âđĽ
â2
Read 2.1
ď˝ Page 103 #17-31 odd, 37, 43, 45,
53-58
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