Question

please answer fast ..is the answer 29 ??​

Answer 1

Given (a + b + c) = 9

and (ab + bc + ca) = 26

(a + b + c)2 = 92

⇒ a2 + b2 + c2 + 2(ab + bc + ca) = 81

⇒ a2 + b2 + c2 + 2(26) = 81

⇒ a2 + b2 + c2 + 52 = 81

⇒ a2 + b2 + c2 = 81 − 52 = 29

here is your answer mark as brainlist

Answer 2

$\huge{\bf{\star{SOLUTION:-}}}$

(a+b+c)² = a² + b² + c² + 2ab + 2bc + 2ca

(a+b+c)² = a² + b² + c² + 2 ( ab+bc+ca)

9² = a² + b²+ c² + 2(26)

81 = a² + b²+ c² + 56

a² + b²+ c² = 81 - 52

a² + b²+ c² = 29

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Cheers,

Nandini

${\red{\huge{\ddot{\smile}}}}$