Graph the function f ( x ) = − x 4 + 2 x 3 + 4 x 2 − 2 on the interval ( − 5 , 5 ) using a graphing utility. Then approximate any local maximum and local minimum values rounded to two decimal places. Determine where the function is increasing and where it is decreasing.
Graph the function f ( x ) = − x 4 + 2 x 3 + 4 x 2 − 2 on the interval ( − 5 , 5 ) using a graphing utility. Then approximate any local maximum and local minimum values rounded to two decimal places. Determine where the function is increasing and where it is decreasing.
Solution Summary: The author explains how to determine the function f(x)=-x4+2 x 2 using graphing utility.
Graph the function
f
(
x
)
=
−
x
4
+
2
x
3
+
4
x
2
−
2
on the interval
(
−
5
,
5
)
using a graphing utility. Then approximate any local maximum and local minimum values rounded to two decimal places. Determine where the function is increasing and where it is decreasing.
Formula Formula A function f(x) attains a local maximum at x=a , if there exists a neighborhood (a−δ,a+δ) of a such that, f(x)<f(a), ∀ x∈(a−δ,a+δ),x≠a f(x)−f(a)<0, ∀ x∈(a−δ,a+δ),x≠a In such case, f(a) attains a local maximum value f(x) at x=a .
Consider the function f(x) = x²-1.
(a) Find the instantaneous rate of change of f(x) at x=1 using the definition of the derivative.
Show all your steps clearly.
(b) Sketch the graph of f(x) around x = 1. Draw the secant line passing through the points on the
graph where x 1 and x->
1+h (for a small positive value of h, illustrate conceptually). Then,
draw the tangent line to the graph at x=1. Explain how the slope of the tangent line relates to the
value you found in part (a).
(c) In a few sentences, explain what the instantaneous rate of change of f(x) at x = 1 represents in
the context of the graph of f(x). How does the rate of change of this function vary at different
points?
1. The graph of ƒ is given. Use the graph to evaluate each of the following values. If a value does not exist,
state that fact.
и
(a) f'(-5)
(b) f'(-3)
(c) f'(0)
(d) f'(5)
2. Find an equation of the tangent line to the graph of y = g(x) at x = 5 if g(5) = −3 and g'(5)
=
4.
-
3. If an equation of the tangent line to the graph of y = f(x) at the point where x 2 is y = 4x — 5, find ƒ(2)
and f'(2).
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