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

Answer 1

Nathan Axel

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)#

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Answer 2

Eva Abramson

To combine the expressions (2x^2 + 7) - (z^2 + 1), you subtract the terms inside the parentheses. So, the combined expression is 2x^2 + 7 - z^2 - 1, which simplifies to 2x^2 - z^2 + 6.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.