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(a-b)^2 doesn't have a numeric value since there are no numbers associated with it, but you can definitely expand it, as it represents a formula, instead of an actual numeric expression.

(a-b)(a-b)

= a^2-ab-ab+b^2

= a^2-2ab+b^2 (which is actually the rule for expanding!)

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Q: What is A-B squared?
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