Question

if a+b+c=9 and ab+bc+ca=40, find a^2+b^2+c^2

Answer 1

Answer:

Step-by-step explanation:

9+2(40)

9+80

=89

Answer 2

Answer:

Step-by-step explanation:

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

a^2+b^2+c^2=(9)^2+2(40)

=81+40

=121