(9j^6+8j^4+6j^2)(4j^2+3j^1)
(9j^6+8j^4+6j^2)(4j^2+3j^1) 9j^6  8j^4  6j^2 4j^2  3j^1
(9j^6+8j^4+6j^2)(4j^2+3j^1) 9j^6  8j^4  6j^2 4j^2 3j^1 36j^8 32j^6 24j^4 27j^7 24j^5 18j^3
(9j^6+8j^4+6j^2+4j^2+3j^1)
(9j^6+8j^4+6j^2+4j^2+3j^1) (9j^6+8j^4+10j+3j^1)

Multyplying binomials and trinomials