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Chapter 11
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Lesson 11.2.3
> Problem 11-77
11-77.
Hint (a):
log(
x
2
+ 21
x
) = 2
Hint 2 (a):
x
2
+ 21
x
= 10
2
More Help (a):
(
x
− 4)(
x
+ 25) = 0
Answer (a):
4
Hint (b):
Hint (c):
Answer (c):
3
Hint (d):
See parts (a) and (b).