Question

if a+b+c =10 and a square+ b square+ c square=36 then ab + bc + ca ??

Answer 1

${(a + b + c)}^{2} = \\ {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca) \\ (ab + bc + ca) =$
100-36/2
74/2
37 is the answer

Answer 2

Answer:

100-36/2

74/2

37 is the answer