1.

Find the following products of the following expression:(5x - 2y) (25x2 + 10xy + 4y2 )  

Answer»

(5x - 2y) (25x2 + 10xy + 4y2

= (5x - 2y) [(5x2 + (5x) × (2y) + (2y)2

= (a - b) (a2 + ab + b2 ) [Where a = 5x, b = 2y] 

= a3 - b3 

= (5x)3 - (2y)3 

= 125x3 - 8y3  



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