Question

if a + b + c = 9 and AB+ BC + CA = 26 find a^2+ b ^2+ c^2​

Answer 1

Step-by-step explanation:

put the formula

(a+b+c)^2

expand it lhs will be equals to 81 (square of 9)

rhs will be ur extended formula

and then solve it.

Answer 2

Hii

you are welcome in my ans

(a + b + c)^2 - 2 ( ab + bc + ca) = a^2 + b^2 + c^2

a^2 + b^2 + c^2 = 81 - 52

a^2 + b ^2 + c^2 = 29

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Hope my ans helps you✌️✊