Question

Y=(1+2z+3z^3)(5z+8z^2-Z^3)
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Answer 1

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