FACTORIZING 6

Factorize 81-4m²

Solution

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

81-4m² = 9²-2²m²      

             = 9²- (2m)²     

             = (9 - 2m)(9 + 2m)

Hence 81 - 4m² = (9 - 2m)(9 + 2m)

TRY THIS…………….

Factorize 169 - 16c²