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F(x)= -2/(x - 1) (find domain)
The domain specifies all valid values that 'x' can take.
The ONLY restriction is if the denominator is zero (can't divide by zero).
setting denominator to zero and solve for x:
x - 1 = 0
x = 1 (this is the ONLY number x can't be)
Therefore, the domain is all real numbers except 1
Or, interval notation:
(-oo, 1) U (1, +oo)
where oo stands for infinity