If a+b+c=12 and a^2+b^2+c^2=40, find ab+bc+ca – InterviewSolution

1.

If a+b+c=12 and a^2+b^2+c^2=40, find ab+bc+ca

Answer»

Answer:

as (a+b+c)^2 = a^2 + b^2 + c^2 + 2(ab+BC+CA)

144= 64 + 2(ab+BC+CA)

ab+BC+CA =40

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