Question

if a + b + C is equal to 6 and ab+bc+ca=11 then find a square +b square+ c square​

Answer 1

Step-by-step explanation:

given,

a+b+c=6 and

ab+bc+ca=11

we know that,

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

6^2=a^2+b^2+c^2+2×11

=36=a^2+b^2+c^2+22

=36-22=a^2+b^2+c^2

=14=a square+b square+c square