A function is a mapping from one set to another such that each element from the first set is mapped onto exactly one element from the second set.
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Domain is a set in which the given function is valid and range is the set of all the values the function takes
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If the function of the variable x, is f(x) then the roots are all the values of x (in the relevant domain) for which f(x) = 0.
An equation is the same as a function. Identifying a functional relationship from a graph is nearly impossible unless it is trivially simple like a linear relationship.
Subtract -13 at each consecutive term and so the next term will be -34