Question

If a+b+c-0 and a^2+b^2+c^2=16, find the value of ab+bc+ca​

Answer 1

Answer:

6

Step-by-step explanation:

Formula,

(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

⇒(a+b+c)

2

=a

2

+b

2

+c

2

+2(ab+bc+ca)

Given,

ab+bc+ca=10,a

2

+b

2

+c

2

=16

⇒(a+b+c)

2

=16+2(10)

a+b+c=

16+20

=6

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