Question

Expand using suitable identity: (2x – 5y) (2x – 5y).

Answer 1

Heya user !!!

Here's the answer you are looking for

(2x – 5y) (2x – 5y)

= (2x - 5y)²

We know (a - b)² = a² - 2ab + b²

So,

(2x – 5y) (2x – 5y)

= (2x - 5y)²

= (2x)² - 2(2x)(5y) + (5y)²

= 4x² - 20xy + 25y²

Therefore, the expansion for (2x – 5y) (2x – 5y) is 4x² - 20xy + 25y².



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Answer 2

Hi !

(2x – 5y) (2x – 5y) = (2x - 5y)²

We know that ,
(a - b)² = a² - 2ab + b²

So, 


=> (2x - 5y)²

=> (2x)² - 2*2x*5y* + (5y)²

=> 4x² - 20xy + 25y²

 (2x – 5y) (2x – 5y) =  4x² - 20xy + 25y².