) Because f(-1) and f' changes from negative to positive at x = f(-1) = -7e-1 is a local (and absolute) minimum.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.5: Rational Functions
Problem 7E
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y
10
Sketch the graph of f(x) = 7xeX.
EXAMPLE 3
(A) The domain of f is R.
8.
(B) The x- and y-intercepts are both
6.
(C) Symmetry: None.
4
(D) Because both 7x and ex become large as x -→ ∞, we have lim,
→ „7xex = ∞. As x → -, however, ex →
and so we have an
indeterminate product that requires the use of l'Hospital's Rule:
7
-2
lim
7xex
lim
7x
lim
x→ -00
X→ -o e-
X > -00
2
lim
-7ex =
X→ -00
Thus the x-axis is a horizontal asymptote.
Video Example )
(E)
f'(x)
= 7xex + 7e =
Since ex is always positive, we see that f'(x) > 0 when x + 1 > 0, and f'(x) < 0 when x + 1 < 0. So f is increasing on
O
and decreasing
, 00
(-
on
-00,
(F) Because f'(-1) =
and f' changes from negative to positive at x =
f(-1) = -7e-1 is a local (and absolute) minimum.
(G)
f"(x)
(7 + 7x)ex + 7ex =
Since f"(x) > 0 if x >
and f"(x) < 0 if x <
f is concave upward on the interval
and concave downward on the interval
. The inflection point is (x, y) =
(H) We use this information to sketch the curve in the figure.
Transcribed Image Text:y 10 Sketch the graph of f(x) = 7xeX. EXAMPLE 3 (A) The domain of f is R. 8. (B) The x- and y-intercepts are both 6. (C) Symmetry: None. 4 (D) Because both 7x and ex become large as x -→ ∞, we have lim, → „7xex = ∞. As x → -, however, ex → and so we have an indeterminate product that requires the use of l'Hospital's Rule: 7 -2 lim 7xex lim 7x lim x→ -00 X→ -o e- X > -00 2 lim -7ex = X→ -00 Thus the x-axis is a horizontal asymptote. Video Example ) (E) f'(x) = 7xex + 7e = Since ex is always positive, we see that f'(x) > 0 when x + 1 > 0, and f'(x) < 0 when x + 1 < 0. So f is increasing on O and decreasing , 00 (- on -00, (F) Because f'(-1) = and f' changes from negative to positive at x = f(-1) = -7e-1 is a local (and absolute) minimum. (G) f"(x) (7 + 7x)ex + 7ex = Since f"(x) > 0 if x > and f"(x) < 0 if x < f is concave upward on the interval and concave downward on the interval . The inflection point is (x, y) = (H) We use this information to sketch the curve in the figure.
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