Question 378140
Let f(x)=−9+9⋅log2(−x−3).
Find the domain 
-x-3 must be positive.
Solve -x-3 > 0
x < -3
Domain is All Real Numbers less than -3
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and range of f(x).
log2(-x-3) is asymptotic to x = -3 but ranges
over all Real Numbers.  Multiplying by 9 and 
subtracting 9 still leaves the range over
All Real Numbers.
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{{{graph(400,300,-10,20,-10,20,-9+9(ln(-x-3)/ln(2)))}}}
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Cheers,
Stan H.