Question

x2+ y2 + z2 + xy + yz - zx by x - y + z.​

Answer 1

Answer:

(x−y−x)(x

2

+y

2

+z

2

+xy−yz+xz)

According to the equation,

a

3

−b

3

−c

3

−3abc=(a−b−c)(a

2

+b

2

+c

2

+ab−bc+ca)

The given question can be written as

=(x

3

+xy

2

+x

2

y−xyz+x

2

z−x

2

y−y

3

−yz

2

−xy

2

+y

2

z−xyz−x

2

z−y

2

z−z

3

−xyz+yz

2

−xz

2

)

So we get,

=(x

3

−y

3

−z

3

−xyz−xyz−xyz)

=x

3

−y

3

−z

3

−3xyz

Answer 2

Answer:

Using identity you can do this question