Exam Maths Puzzle Algebra

For the following piecewise defined function find f(1)

f(x) = {x^2=1,.....x<0
f(x) = {x-1,.......x>0

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Exam Other Question

How do you solve this equation?
1/(x-1) + 2/x = x/(x-1)
True or False
The domain of x^2 + 2 is (-00;+00) and the range is (2;+00)