Answer:
Step-by-step explanation:
multiplying the first bracket with the second (step by step)
= 1( 5z + 8z^2 - z^3) +2z ( 5z + 8^2 - z^3 )+3z^3 (5z + 8^2- z^3)
= 5z + 8z^2 - z^3 + 10z^2 + 16z^3 - 2z^4 + 15z^4 + 24z^5 -3z^6
=5z + 16z^2 + 15z^3 + 17z^4 + 24z^5 -3z^6
