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Verified answer
1.)2ab - 3a + 4b - 3ab=
2(-10) - 3(2) + 4(-5) - 3(-10)=
-20 - (6) + (-20) + 30=
-26 + 10= -16
2).
-3a²b² + ab + 2a=
-3(2)²(-5)² + (-10) + 4=
-300 + -6=
-306
3).
a(a+b) -b(a+b) =
2(2+-5) - (-5) (2+ -5)=
6 + 5(-3)=
8