Question

If a=1 , b= -1, c=2 then the value of a²+b²+c²−ab−bc−ca =

Answer 1

Answer:

7

Step-by-step explanation:

1 ^2+(-1^2) +2^2-1×(-1) -(-1) ×2-2×1=7

Answer 2

Answer:

[tex]a {}^{2} + b {}^{2} + c {}^{2} - ab - bc - ca = \\ 1 {}^{2} + (- 1 {}^{2} ) + 2 {}^{2} - (1 \times 1) - ( - 1 \times 2) - (2 \times 1) \\ 1 - 1 + 4 - 1 + - 2

Final answer = 3 +(-2)

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