Thursday, August 27, 2015

Solve the inequality 10 l 10n - 8 l

The first step is to simplify the given expression,
dividing it by 10 both sides:


10|10n -
8|<80


|10n -
8|<8


Now, we'll discuss the absolute value of the
expression 10n - 8:


Case 1) 10n - 8 for 10n -
8>=0


10n>=8


n>=8/10


n>=4/5


We'll
solve the inequality:


10n - 8 <
8


10n < 16


n <
16/10


n <
1.6


The interval of admissisble value of n,
for this situation,  is [4/5 , 1.6).


Case 2)
8 - 10,  for 10n -
8<0


n<4/5


We'll
solve the inequality:


8 - 10n <
8


-10n < 0


10n >
0


n >
0


The interval of admissible values for n,
for this case, is (0 , 4/5).

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