Question

How do you combine `(2x^2 + 7) - (z^2 + 1)`?

Answer 1

You subtract like terms.

Explanation:

This expression can be written by removing the parantheses like this

`2x^2 + 7 - z^2 - 1`

Finally, you can subtract like terms, which in your case are the terms that do not contain `x^2` or `z^2`

`2x^2 - z^2 + 7 -1 = color(green)(2x^2 - z^2 + 6)`