Question

Simplifique a expressão (a-b)²-(2a+b)•(2a-b)

Answer 1

( a -b)² -(2a +b) . (2a -b) = 0

( a - b ) . ( a - b ) = a² -ab -ab +b² = a² -2ab + b²

a² -2ab + b² + ( -2a -b ) . ( 2a - b )

( -2a - b ) . ( 2a - b ) = -4a² +2ab -2ab + b² = -4a² + b²

a² -2ab + b² -4a² +b²

-3a² -2ab +2b²