Question

pls answer this
Who will first answer my question I will mark he/she as brilliant ​

Answer 1

Answer:

(b) x^2 +y^2+z^2

Step-by-step explanation:

(x-y) (x+y) +(y-z) (y+z) +(z-x)(z+x)

+ and - will cancel each other out and so each of the kind above will be cancelled out (+y and -y, +z and -z, -x and +x) and then we end up with,

x×x+y×y+z×z=x^2 +y^2+z^2

Therefore, the answer is

x^2 +y^2+z^2.

Hope this Helps:)