Question

a2 +b2+c2=20व a+b+c=0तोab+bc+ca=?
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Answer 1

Answer:

ab+bc+ca = -10

Step-by-step explanation:

a²+b²+c² = 20 ---(1)

a+b+c = 0 ----(2)

/* On Squaring both sides of the equation, we get

=> (a+b+c)² = 0²

=> a²+b²+c²+2ab+2bc+2ca=0

=> 20+2(ab+bc+ca) = 0

=> 2(ab+bc+ca) = -20

=> ab+bc+ca = (-20)/2

=> ab+bc+ca = -10

Therefore,

ab+bc+ca = -10

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