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
= 16
x
[*] (2
3
)
2x-4
= (2
4
)
x
[*] 3(2x - 4) = 4x[*] 6x- 12 =4x[*] 2x= 12[*]x=6.
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