Question

Find the value of ab + bc + ac,
where a + b + c =10 and
a² +b² +c² = 20​

Answer 1

Answer:

We know, (a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

(10)

2

=36+2(ab+bc+ca)

100−36=2(ab+bc+ca)

2(ab+bc+ca)=64

(ab+bc+ca)=32

Step-by-step explanation:

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