Question

( -a -b² ) . ( -a+b² )

Answer 1

a^2+ ab^2 - ab^2 - b^4=
= a^2 - b^4

Answer 2

$(-a -b^2) (-a + b^2) \\ (-a)^2 - ab^2 + b^2a - b^4 \\ a^2 - b^4$