Question

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

Answer 1

(a+b+c)^2=a^2 + b^2 + c ^2+ 2(ab + bc + ca)
(9)^2= a^2+ b^2+ c^2+2(40)
a^2+b^2+c^2=81-80=1 ans.

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Answer 2

your answer is in this picture.