Question

if A+B+C =9 and ab +bc+ ca =26find a^2+ b^2+c^2
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Answer 1

Step-by-step explanation:

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

(9)^2=a^2+b^2+c^2+2(26)

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

81-52=a^2+b^2+c^2

29=a^2+b^2+c^2