Question

If a+b+c=a and ab+bc+ca=26 than find a square + b square + c square

Answer 1

we know that

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

Substituting values given

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

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

a^2 = a^2 +b^2 + c^2 + 52

-52 = b^2 + c^2

pls check your question if is it a+b+c = a