Math, asked by kakkar6644, 1 year ago

(a²+b²+c²) = 20
(a+b+c) = 0
(ab+bc+ca) = ?

99 points.....

kakkar6644: Deepas do u know the answer?

kakkar6644: Or just gaining 50 points

deepas05122001: I know the answer plz

DakshP: answer is -10

Anonymous: Given

Answers

Answered by deepas05122001

Squaring the given equation (a+b+c)^2 = 0^2 a^2+b^2+c^2+2ab+2bc+2ca = 0 According to given 1st equation, 20+2(ab+bc+ca) = 0 ab+bc+ca = -20/2 = -10

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deepas05122001: No plz

kakkar6644: Kmm

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kakkar6644: Clash of clans

deepas05122001: Nope

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Anonymous: :(

deepas05122001: What happened awsumsingle

Answered by kvnmurty

a+b+c=0
square on both sides, a²+b²+c²+2ab+2bc+2ca=0²=0
substituting the value of a²+b²+c²=20,
20 + 2(ab+bc+ca) = 0

so ab+bc+ca = -20/2 =-10

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