Question

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

Answer 1

(2x-5y)(2x-5y)
(2x-5y)^2
4x^2+25y^2-20xy


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Answer 2

( 2x - 5y ) ( 2x - 5y )

( 2x - 5y )²

Using formula ( a - b )² = a² + b² - 2ab

Where, a= 2x and b = 5y

So,

( 2x - 5y )²

(2x)² + (5y)² - 2 × 2x × 5y

4x² + 25y² - 20xy.

This is the answer,


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