Each of the following rules defines a function with domain the set of all real numbers. Express each rule in the form of an equation.
Example: The rule For each real number, compute its square can be written y = x2.
(a) For each real number, subtract 3 and then square the result.
(b) For each real number, compute its square and then subtract 3 from the result.
(c) For each real number, multiply it by 3 and then square the result.
(d) For each real number, compute its square and then multiply the result by 3.
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