SOLUTION: 4^3x-2^3x= 20 what is the value of x
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Question 356236: 4^3x-2^3x= 20 what is the value of x
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Use a substitution, let , then
Two solutions in u:
.
.
.
No power of 2 will give a negative answer.
No solution from this u value.
.
.
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