Question

2a×a+2b×b+2c×c-2ab-2bc-2ca

Answer 1

2a^2 + 2b^2 + 2c^2 -2ab -2bc - 2ca

(a-b-c)^2

Answer 2

Hey!!!

2a×a+2b×b+2c×c-2ab-2bc-2ca

2a^2+2b^2+2c^2 - 2( ab+bc+ca )

2(a^2+b^2+c^2 ) - 2 ( ab+bc+ca )

Hope it helps☺!