Factorize the following expression
$b^{2} - 4$

(b + 2) (b - 2)

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(b - 2) (b - 2)

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(b + 3) (b + 2)

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None of these

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Solution

The correct option is A $(b + 2) (b - 2)$
Given,
$b^{2} - 4$

Using Indentity
$a^{2} - b^{2} = (a - b) (a + b)$

$= (b - 2) (b + 2)$

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