1.

Simplify ( 2x – 5y )²-(2x+5y)².​

Answer»

Step-by-step EXPLANATION:

(2x-5y)²-(2x+5y)²

= 4x²-20xy+25y- ( 4x²+20xy+25y)

= 4x²-20xy+25y -4x²-20xy-25y

=-40xy



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