Describe the domain and range of the function.
f(x, y) = ln(xy − 10)
(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
all real numbers
z ≥ 0
z ≠ 0
z > 0
z ≥ 1
Inside ln we must have positive number.
So, xy-10 > 0
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