(2z*5-8z*4+3)+(5z*5-z-4)?

Question

can you help me out?

Answer 1

combine like terms

(2z*5-8z*4+3)+(5z*5-z-4) --> add 2z^5 and 5z^5

7z^5 - 8z^4 + 3 - z - 4 --> add 3 and -4

7z^5 - 8z^4 - z - 1

Answer 2

(2z*5-8z*4+3)+(5z*5-z-4)

Combine terms ?
7z^5 -9z -1