# Algebra

Find the domains of rational expressions
2b-2/2b^2-8

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1. (2b-2)/(2b^2-8)

2b^2-8 = 0
2b^2 = 8
b^2 = 4
b=+-2 Gives a denominator of zero which
makes the expression Undefined.

Domain: All real values of b except +2
and -2.

Mathematically: -2 > b > 2.

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posted by Henry
2. mathematically, |b| ≠ 2
or b^2 ≠ 4

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posted by Steve

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