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A is not B

Algebra Level 1

Which of the following equals $\dfrac { { a }^{ 2 }-{ b }^{ 2 } }{ a-b }$ for $a\neq b$ ?

b-a

a-b

a+b

{ a }^{ 2 }{ +b }^{ 2 }

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by Archit Boobna

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