# <span lang="EN-US

Given,

9a2 – b2 + 4b – 4

= 9a2 – (b2 – 4b + 4)

By using the formula a2 – b2 = (a + b)(a – b)

We get,

9a2 – b2 + 4b – 4 = 9a2 – (b2 – 4b + 4)

= (3a)2 – (b – 2)2

= {3a + (b – 2)}{3a – (b – 2)}

= (3a + b - 2)(3a – b + 2)

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