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

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Answer 1 · 2015-07-30T10:24:08

You subtract like terms.

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 $z^2$

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

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