Question

If a+b+c=8 and ab+bc+ca=19 find a square+ b square + c square

Answer 1

(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)

64=38+a^2+b^2+ c^2

a^2+b^2+c^2=64-38

=26

HOPE THIS WILL HELP U