Question

Describe the domain and range of the function.
f(x, y) = ln(xy − 10)
Domain:


(x, y): x > 10, y > 10

 

(x, y): x is any real number, y is any real number

 


(x, y): xy ≠ 10

 

(x, y): xy > 10

 

(x, y): xy ≥ 10


Range:
all real numbers

z ≥ 0

z ≠ 0

z > 0

z ≥ 1

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