Question

a²+b²+c²+ab+bc+ca if a=1,b=-2 and c=3

Answer 1

Answer:

1^2+(-2)^2+(3)^2+1×-2+(-2)×3+3×1

1+4+9-2-6+3

17-8

9

Answer 2

Answer:

1²+(-2)²+3²-2-6+3

1+4+9-2-6+3

14-2-6+3

14-2-3

14-5

9