Question 1068968
A function is a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output
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Consider the ordered pair (x, y) where x is an element in the set X and y is an element in y such that f(x) = y, f is a function then there can be only one ordered pair with the same value of x.
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We exclude negative values for x, since square root of negative number is an imaginary number
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For any non-negative real number x, there is one and only one non-negative real number s^2 such that s^2=x. (For example: If x=16, then s=4.) This is called the principal square root of x.
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y = sqrt (x-3) is a function for all x > or = 3
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