Question

i fa+ b+c=6 and ab + bc+ ca=13 findasquare+bsquare+ csquare

Answer 1

A2+b2 +c2=(a+b+C) 2+2ab+2bc+2ca
=(6) 2+2(13) = 36+26=62

Answer 2

a^2 + b^2 + c^2 = ( a + b + c )^2 - 2( ab + bc + ca)
                           = 36 - 26 = 10 ANSWER.
thanks...