Question

if a2+b2+c2=25 and ab+bc+ca=3 find a+b+c

Answer 1

Answer:

given- a2+b2+c2 = 250

         ab+bc+ca=3

using identity (a+b+c)^2=a2+b2+b2+2ab+2bc+2ca

(a+b+c)^2= 250+2(3)

              = 256

               a+b+c=  √256

                     =+- 16

(mean 16 is in positive and negative) 

Answer 2

Answer:

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