单选题
For what value of x is 8
2x-4
= 16
x
?
A. 2
B. 3
C. 4
D. 6
E. 8
A
B
C
D
E
【正确答案】
D
【答案解析】
Use the laws of exponents to simplify the equation, and then solve it:
8
2x-4
= 16x[*](2
3
)
2x-4
= (2
4
)
x
[*] 3(2x-4) = 4x[*] 6x- 12 = 4x[*]
2x= 12[*]x= 6.
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