Question

Find the value of the expression a2 + b2 + c2 + ab-bc- ca for a = 1, b = 2 and c=-1

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Answer 1

Answer:

=a²+b²+c²+ab -bc -ca

=1²+2²+(-1)²+1×2 -(2×-1) -(1×-1)

=1+4+1+2+2+1

=11

hope it helps uhh.....

Answer 2

Step-by-step explanation:

1+4+1+2+2+1

=11

hope it helps!!!!