Question

a2+b2 +c2 = 9.
ab+bc+ca = 8

(a+b+c) 2 = ?

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Answer 1

Answer:

5, - 5

Step-by-step explanation:

We know that (a + b + c) ² = a² + b² + c² + 2(ab + bc + ac)

=> (a + b + c) ² = 9 + 2(8) (putting values)

=> (a + b + c) ² = 25

=> (a + b + c) = 5, - 5

Answer 2

Answer:

Step-by-step explanation:

Given that,

a² + b² + c² = 9 and ab + bc + ca = 8

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

= 9 + 2 ( 8 )

= 9 + 16

= 25 is the answer.