Question

It
a+b+c=6
a2+b2+c2= 34
then
ab+bc+ca is​

Answer 1

Answer:

a² + b² + c² = 34

(a+b+c)² - 2ab - 2bc - 2ac = 34

6² - 2ab - 2bc - 2ac = 34

-2(ab + bc + ac) = -2

ab + bc + ac = 1

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