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Sunday, November 8, 2015

Floor function system

Solve the following equation in the real number system:

log2x+log4x=3

Since log2x>log4x, we can formulate two possibilities to make the sum of the LHS as 3, i.e. log2x+log4x=3+0or=2+1, but since log2x=3 gives x=8 and log4x=0 gives x=1, we know x<8 and log2x=2 gives x=4 and log4x=1 gives x=4, so we can conclude the range of values of x that satisfies log2x+log4x=3 is [4,8).


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