FACTORIZE 1

Factorize 81-9m²

Solution

We use difference of two squares a² – b² = (a - b)(a + b)

81-9m² = 9² - 3²m²       

             = 9² - (3m)²     

             = (9 - 3m)(9 + 3m)

Hence 81 - 9m² = (9 - 3m)(9 + 3m)

TRY THIS…………….

Factorize 225 - 16c²