If a+b+c = 0 & a2 + b2+ c2 = 16 find the value of ab + bc + ca
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use formula
(a+b+c)² = a²+b²+c²+2ab+2bc+2ca
2(ab +bc+ca) = (a+b+c)² -(a²+b²+c²)
2(ab+bc+ca)= 0-16
ab+bc+ca = -16/2
= -8
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NeelamG:
u did mistake
-16/2 = -8
is the right ans
sry
next time
dhayan
correct it if u can
ok
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