II. f(x) = sin
x + cos x, 
III. f(x) = 4x
IV. f(x) = (x ? 1)2
+ 3x 
Answer:
f(x) = x3, 
f?(x) = 0
x = 0 
x
-2
0
2
f(x)
-8
0
8
Absolute
maximum value of f?(x) = 8 at x = 2 and absolute minimum value of f(x) = ?8 at
x = ?2.
II. f(x) = sin
x + cos x, 
x
0
f(x)
1
-1
About
maximum value of f(x) 
and
absolute minimum value of f(x) ?1 at x = 
III. 
f?(x) = 0 
x
?2
4
9/2
f(x)
?10
8
63/8
f(x) have
absolute maximum value = 9 at x = 4 and absolute minimum value = ? 10 at x =
?2.
IV. f(x) = (x ? 1)2
+ 3, 
X
?3
1
f(x)
19
3
f(x) have
absolute maximum value = 19 at x = ?3 and absolute minimum value = 3 at x = 1.
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