Question

if a is equal to b is equal to 3 C is equal to 1 then the value of a square + 2 b square + c square is​

Answer 1

Answer:

a² + b² + c² = 20

a+b+c = 0

Using this formula :

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

So,

(0)² = 20 + 2(ab + bc + ca)

=> 0 = 20 + 2(ab + bc + ca)

=> -20 = 2(ab + bc + ca)

=> -20/2 = (ab + bc + ca)

=> -10 = (ab + bc + ca)

Hence,

ab+ bc+ca = -10

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