Question

(-8m-6)(9n+5)+(-5m-3)(-8n+1)

Answer 1

(-8m-6)(9n+5)+(-5m-3)(-8n+1)=
-8m•9n - 8m•5 - 6•9n - 6•5 - 5m•(-8n) - 5m•1 - 3•(-8n) - 3•1=
-72mn - 40m - 54n - 30 + 40mn - 5m + 24n - 3=
-32mn - 45m - 30n -33