Question

if a+b+c=5 and a square+b square+c square=29 then ab+bc+ca

plz tell answer few mins ​

Answer 1

Answer:

The correct answer is-2

Step-by-step explanation:

a+b+c=5 a² + b² + c² = 29

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

25 29 + 2(ab + ac + bc)

2(ab + bc + ac) = -4

ab + bc + ac = -2