Question

 If a + b + c = 11 and ab + bc + ca = 27, then find a² + b² + c²​

Answer 1

Answer:

a²+b²c²= a+b+c+2ab 2bc+2ca

= 11+2(ab+BC+ca)

= 11+2×27

=65

Answer 2

Answer:71

Step-by-step explanation:

By formula,

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

(11)^2=a^2+b^2+c^2+2×27

121=a^2+b^2+c^2+54

121-54=a^2+b^2+c^2

71=a^2+b^2+c^2

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