If a + b + c = 9 and ab + bc + ca = 26, Find a 2 + b 2 + c 2 .
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(A+b+c)3=a3+b3+c3+ab+BC+ca.
(9)3=x+26.
X=27-26
X=1
A2+b2+c2=1
(9)3=x+26.
X=27-26
X=1
A2+b2+c2=1
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