Question

Number 5 ABC or D? Please help

Answer 1

D

Explanation:

you want to solve it out

start with multiplying z to each. you don't multiply it to the 6 because it is in the same parenthesis set, but you multiply it to everything in the other set. After multiplying, you get:
`2z^3` ,
`3z^(2)` ,
`5z`

now do that to the 6. After multiplying you get:
`12z^(2)`,
`18z`,
`30`

now set it all next to each other
`2z^3` +
`3z^(2)` +
`5z` +
`12z^(2)` +
`18z` +
`30`

now combine like terms. start with the to the highest power. since there is only one that has a third power, you put that one first. then you combine the squared ones, and so forth.

work combining the squares:
`3z^(2) + 12z^(2) = 15z^(2)`

work combing the single z's:
`5z + 18z = 23z`

to get this:
`2z^3` +
`15z^(2)` +
`23z` +
`30`

so, the answer is D