Question

If a = 1 , b = -2 & c = 3 , then find the value of a2 + b2 + c2 + ab + bc + ca.
Please answer this ​

Answer 1

Answer:

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Step-by-step explanation:

1+4+9-2-6+3

14-2-6+3

12-6+3

6+3

9

Answer 2

Answer:

9

Step-by-step explanation:

a2+b2+c2+ab+bc+ca

=(1)2 + (-2)2 + (3)2+(1×-2) +(-2×3) +(3×1)

= 1 + 4 + 9 -2 -6 + 3

=17 - 8= 9