Question

(a+b)(a-b)+(b+c)(b-c)+(c+a(c-a)​

Answer 1

(a^2-b^2) +(b^2-c^2) + (c^2-a^2)

Now we will open the brackets,

a^2-b^2+b^2-c^2+c^2-a^2

The positive and negative a^2, b^2, and c^2 will cancel out.

Therefore the answer will be zero.

HOPE THIS HELPS :)