Question

If a + b + c = 29 and a b + bc + ca equal to 26 find a square + b square + c square

Answer 1

Using identity (a + b+ c )^2

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

(a + b + c )^2 + ( 26)

(29)^2 + 26

841+26

867