Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
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Question

Only need question (c), and the answer is [15,16] but I don't know why 

3. Consider the function
f(x) =
az²+b, x<2
x ≥ 2
36
I+1¹
(a) Determine the numbers a and b so that y = f(x) is differentiable for all c.
Contatzi4a+b = 12
Diff. 4²1 4a = - 4
f(x) =
ť'
a=-1
{x)
=
f
I is decreasing
36
(x+1)²
2
x<2.
(b) Assume the values of a and b obtained in (a). Sketch the graph of the function f using the first
derivative and determine its range.
(as its derivative
x² +16
36
(x+1)
Las
b = 12-49 = 16
for x 22
<o)
range
12
x < 2
x>2
(c) Determine the range of the composite function y = f
arctanx has
(--플,풀.)
arctem x
range (-1, 1)
and is
arctan a
)
a
So
quacuatic pambule
Range: (-00, 16]
f(arctaux)
has range [15, 16]
10
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Transcribed Image Text:3. Consider the function f(x) = az²+b, x<2 x ≥ 2 36 I+1¹ (a) Determine the numbers a and b so that y = f(x) is differentiable for all c. Contatzi4a+b = 12 Diff. 4²1 4a = - 4 f(x) = ť' a=-1 {x) = f I is decreasing 36 (x+1)² 2 x<2. (b) Assume the values of a and b obtained in (a). Sketch the graph of the function f using the first derivative and determine its range. (as its derivative x² +16 36 (x+1) Las b = 12-49 = 16 for x 22 <o) range 12 x < 2 x>2 (c) Determine the range of the composite function y = f arctanx has (--플,풀.) arctem x range (-1, 1) and is arctan a ) a So quacuatic pambule Range: (-00, 16] f(arctaux) has range [15, 16] 10
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