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= 4a+5a-6b+3b-2
= 9a-3b-2
b. 40xy-45xz-40xy-72yz
= 40xy-40xy-45xz-72yz
=-45xz-72yz
=2(a+3b)+5a+3b-2
=2a+6b+5a+3b-2
=2a+5a+6b+3b-2
=7a+9b-2
b. 8y(5x-9z)-5x(8y)-9z
=40xy-72yz-40xy+40xz
=40xy-40xy-72+40xz
= -72+40xz