What term should be added to $a^{2} - 2 a b$ to make it a perfect square?

b

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b^{2}

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a^{2}

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2 a b

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Solution

The correct option is B $b^{2}$
To make $(a^{2} - 2 a b)$ a perfect square, $b^{2}$ is to be added.
So that $(a^{2} - 2 a b + b^{2})$ will be come a perfect square using the identity $(a - b)^{2} = (a^{2} - 2 a b + b^{2})$ .

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