Question

find the value of a2 + b2 + c2 if a + b+ c =9 and ab + bc + ca = 26

Answer 1

Answer:

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Step-by-step explanation:

a + b+ c = 9

on squaring,

a² + b² + c² + 2 (ab+bc+ca) = 81

a² + b² + c² + 2 (26) = 81

a² + b² + c² = 81 - 52

                  = 29

Answer 2

Answer:

Step-by-step explanation:

square a + b + c and substitute to get a2 + b2 + c2 = 29