Question 80370
You're not reading it right. You've got to know exactly what
the expression means before you can solve it.
Read it like this:
"The log to the base 2 which gives me 1/2 is what?"
Or what means the same thing:
"What power do I raise 2 to in order to get 1/2?"
{{{2^x = 1/2}}}
{{{x = -1}}}
Remember:
{{{2^3 = 8}}}
{{{2^2 = 4}}}
{{{2^1 = 2}}}
{{{2^0 = 1}}}
{{{2^-1 = 1/2}}}
{{{2^-2 = 1/4}}}
{{{2^-3 = 1/8}}}