What is the expansion of $(a - b)^{2}$ ?

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

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

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

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None of the above

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Solution

The correct option is B $a^{2} + b^{2} - 2 a b$
$(a - b)^{2} = a^{2} + b^{2} - 2 a b$

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