Question

if a+b+c=9 and ab+bc+ca=35, then this is the value of $a^2+b^2+c^2$ ...answer only if you are sure about it.

Answer 1

Step-by-step explanation:

We know that

(a+b+c)

2

=a

2

+b

2

+c

2

+2(ab+bc+ca)

Given ab+bc+ca=q

a+b+c=p

=>p

2

=a

2

+b

2

+c

2

+2(q)

=>a

2

+b

2

+c

2

=p

2

−2q

Answer 2

check the attached file above..

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