Question

a+b+c = 9, ab + bc+ca=23, a ² + b ² + c=?​

Answer 1

Answer:

Step-by-step explanation:

If a+b+c=9

Squaring both sides, we get

a^2+b^2+c^2+2(ab+bc+ac)=81

Or a^2+b^2+c^2=81-2(23)

=81-46

=35