Question

c) Subtract :-
-x² - 4z from 2x² + 3y – 7z​

Answer 1

given

-x²-4z from 2x²+3y-7z

=2x²+3y-7z-(-x²-4z)

=2x²+3y-7z+x²+4z

=3x²+3y-3z

now you can take 3 as commom

then,

3(x²+y-1)=0

x²+y-1=0 is the answer