Question

Select the correct difference. -3z 5 - (-7z 5) (A)-10z5 (B)-4z5 (C)4z5 (D)4z

Answer 1

Correct choice is (C).
`4z^5`.

Explanation:

Given expression is
`-3z^5-\left(-7z^5\right)`.

Now we need to simplify that then select the correct difference value from the given choices.

`-3z^5-\left(-7z^5\right)`

negative times negative is positive

`=-3z^5+7z^5`

Combine like terms because variable z has same exponent.

`=(-3+7)z^5`

`=4z^5`

Hence correct choice is (C).
`4z^5`.