Question

if a+b+c=9and ab+bc+ca=25 find 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(25)

81=a^2+b^2+c^2+50

a^2+b^2+c^2=81-50

a^2+b^2+c^2=31

Hope this answer helps you !!!

Answer 2

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