Factorize the following expressions:
b2 – 4
= b2 – 4
Given equation can be simplified as,
= (b)2 – (2)2
It is of the form (p)2 – (q)2
where p = b and q = 2
∴ using the identity (p)2 – (q)2 = (p + q)(p – q)
We get,
⇒ b2 – 22 = (b + 2)(b – 2)
b2 – 4 = (b + 2)(b – 2)
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