x2 - y2 = (x + y)(x - y) is an identity, not a function.
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For an algebraic function in one variable, as many as the highest power of the variable.
It is a function notation
Below is a rule that is an example of a non-linear function when b is 49, a is 7 and a is a function of b: a = square root of b 7 = square root 49 7=7
Algebraic terms is when a letter, for example 'x', represents a number in a formula or sum.
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