# Functions: Variable Replacement Problem

The problem reads:

If a @ b = 3a - b^2 find 2 @ (3 @ 1)

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#### Solution Preview

Solution. In this problem, the "@" symbol means a rule, like f(x,y)=x+3y is a function f: (x,y)->x+3y. I ...

#### Solution Summary

A functional relation is evaluated. The variable replacement problems for functions are given.

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