a-b=3
b-c=5
a^2+b^2+c^2-ab-bc-ca=?
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a=3-b;
c=5-b;
(3-b)²+(b²)+(5-b)²-b(3-b)-b(5-b)-(3-b)(5-b);
9+b²-6b+b²+25+b²-10b-3b+b²-5b+b²-15+3b-5b+b²;
(9+25-15-6b-10b-3b-5b+3b-5b+b²+b²+b²+b²+b²+b²
19-26b+6b²:
6b²-26b+19=0;
you can solve after this hopebu like
c=5-b;
(3-b)²+(b²)+(5-b)²-b(3-b)-b(5-b)-(3-b)(5-b);
9+b²-6b+b²+25+b²-10b-3b+b²-5b+b²-15+3b-5b+b²;
(9+25-15-6b-10b-3b-5b+3b-5b+b²+b²+b²+b²+b²+b²
19-26b+6b²:
6b²-26b+19=0;
you can solve after this hopebu like
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