Question

It 2a = zy 7² then xy + z =​

Answer 1

Answer:

I don't know the answer of the following ad

Answer 2

Answer:

x+y+z=0

⇒x+y=−z

∴x

2

+xy+y

2

=x

2

+2xy+y

2

−xy

We know x

2

+2xy+y

2

=(x+y)

2

=(x+y)

2

−xy

=(−z)

2

−xy=z

2

−xy