Problem: If x is positive and logx≥log2+1/2logx, then:
Answer Choices:
A. x has no minimum or maximum value
B. the maximum value of x is 1
C. the minimum value of x is 1
D. the maximum value of x is 4
E. the minimum value of x is 4
Solution:
1/2logx≥log2
logx≥log4
x≥4
or
logx≥log2x
x≥2x
x≥2
x≥4