ALGEBRA C2D

Factorize 121-9m²

 

Solution

 

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

 

121-9m² = 11² - 3²m²       

             = 11² - (3m)²     

             = (11 - 3m)(11 + 3m)

 

Hence 121 - 9m² = (11 - 3m)(11 + 3m)

 

TRY THIS…………….

 

Factorize 225 - 36c²