Exam Maths Puzzle Algebra

State the domain of r(x) and range of r(x) in the equation r(x)=(6x+12)/(x^2-16)

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Exam Other Question

For the following piecewise defined function find f(1)
(x) = {x^2+1,....x<0
{x-1,......X>0
For the following piecewise defined function find f(-1)

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