Question

Question #8db74

Answer 1

`?=x=1/a^2+ 1/b^2+ 1/c^2`

Explanation:

If `b*c + c*a + a*b = 0`,

Prove that `1/a^2 -b*c + 1/b^2 - c*a + 1/c^2 -a*b = x`.

Solve for x, I presume this is what the problem is you are trying to solve. This is not really something you actually call a proof, since you are solving for an unknown...

We can rewrite `1/a^2 -b*c + 1/b^2 - c*a + 1/c^2 -a*b = x` this to:
`1/a^2+ 1/b^2+ 1/c^2 = x + b*c + c*a + a*b`
`1/a^2+ 1/b^2+ 1/c^2 = x + 0`
So, `x` or your question mark, `?=x=1/a^2+ 1/b^2+ 1/c^2`.

Answer 2

Image reference....

Explanation:

Hope it helps....
Thank you