Question

a*a*b(a*a*a-a+1)+ab(a*a*a*a-2a*2a)-b(a*a*a-a*a-1)

Answer 1

a²b(a³-a+1)+ab(a⁴-4a²)-b(a³-a²-1)
=a⁴b-a³b+a²b+(a^5)b-4(a^6) b-a³b+a²b+b
=a⁴b-2a³b+2a²b+(a^5)b-4(a^6)b+b