Question

${a}^{2} + {b}^{2} + {c}^{2} - ab - bc - ca =$
give me the answer​

Answer 1

a²+b²+c² -ab -bc -ca

(a-b-c)² = a² + b² + c² – 2ab + 2bc – 2ca

a²+b²+c² -ab -bc -ca = (-a-b-c)²