a+b+c= 6
a²+b²+c²=3
ab + b c + ca = ?
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Answer:
33/2
Step-by-step explanation:
given
a + b + c = 6
on squaring in both side
(a + b + c)^2 = 36
a^2 + b^2 + c^2 + 2(ab + bc + ca) = 36
3 + 2 (ab + bc + ca ) = 36
2( ab + bc + ca ) = 36 - 3
ab + bc + ca = 33/2
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