Question 36717
y = log 2(x - 3)
find critical points
when x = 3
y = log2(0)
this is saying
{{{2^y = 0}}}
the only value of y that makes this true is y = minus infinity
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whe x = 4
y = log2(1)
this says 
{{{2^y = 1}}}
y = 0 makes this true- anything to the zero power is 1
{{{ graph( 300, 300, -1, 10, -6, 10, log(2, (x - 3)))}}}