Question

(ii) subtract -x^2 - 4z from 2x² + 3y - 7z​

Answer 1

(2 x² + 3 y - 7 z) - (-x² - 4 z)

= 2 x² + 3 y - 7 z + x² + 4 z

= 3 x² - 3 y - 3 z

= 3(x² - y - z)

Note : the underline one is the final answer  

Answer 2

Answer:

3 x² - 3 y - 3 z

Step-by-step explanation:

(2 x² + 3 y - 7 z) - (-x² - 4 z)

= 2 x² + 3 y - 7 z + x² + 4 z

= 3 x² - 3 y - 3 z

Hope it helps you