4(a+5b)
4
-(5b - 4)(25b2 + 20b + 16)
4(4b + 5)(16b2 - 20b + 25)
no
If it's a Conn trumpet, it's the model number. The Conn 20B is a student model horn.
20b rotary
5b
40b2
The Electric Company - 1971 20B 6-20 was released on: USA: 12 November 1976
20B to 20 KB
24ab - 42ax - 20b + 35x = 6a(4b - 7x) - 5(4b - 7x) = (4b - 7x)(6a - 5)