Friday, 3 September 2021

ALGEBRA B4

 

Factorize 225-9m2

 

Solution

 

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

 

225-9m2 = 152 - 32m2       

             = 152 - (3m)2     

             = (15 - 3m)(15 + 3m)

 

Hence 225 - 9m2 = (15 - 3m)(15+ 3m)

 

TRY THIS…………….

 

Factorize 81 - 49c2


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