Question

( 2x+5y)² - 1 (2x+5y)² - 1

Answer 1

Answer:

-1 or 50y^2 +10xy -1

Step-by-step explanation:

i couldn't tell the exact answer sry but i hope it helps you mark brainliest

Answer 2

Answer:

-1

Step-by-step explanation:

$= {4x}^{2} + 40xy + {25y}^{2} - 1( {4x}^{2} + 40xy + {25y}^{2}) - 1 \\ = {4x}^{2} + 40xy + {25y}^{2} - {4x}^{2} - 40xy - {25y}^{2} - 1 \\ = - 1$