Question

PLEASE SOLVE THIS OR MY LIFE WILL GO ​

Answer 1

Answer:

Step-by-step explanation:

Given that,

( a + 2b ) ( a - b ) + ( a - 2b ) ( a + b )

=[ a ( a - b ) + 2b ( a - b ) ] + [ a ( a + b ) - 2b ( a + b ) ]

= [ a² - ab + 2ab - 2b² ] + [ a² + ab - 2ab - 2b² ]

= a² - ab +2ab - 2b² + a² + ab -2ab - 2b²

= a² - 4b² is the answer.