if a+b+c=0 and a^2+b^2+c^2=16 what is ab+bc+ca
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⇒( a + b + c ) = 0
⇒(a + b + c )² = 0
⇒ a² + b² + c² +2ab +2bc + 2ca=0
⇒16 + 2(ab+bc+ca)=0
⇒2(ab + bc + ca) = -16
⇒ ab + bc + ca = -8
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⇒( a + b + c ) = 0
⇒(a + b + c )² = 0
⇒ a² + b² + c² +2ab +2bc + 2ca=0
⇒16 + 2(ab+bc+ca)=0
⇒2(ab + bc + ca) = -16
⇒ ab + bc + ca = -8
___________________
HOPE IT HELPS U☺☺✌
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