If a−b=5a-b=5a−b=5 and ab=36ab=36,
Using a2+ab+b2=(a−b)2+3ab=25+3(36)=25+108=133a^2+ab+b^2=(a-b)^2+3ab=25+3(36)=25+108=133a2+ab+b2=(a−b)2+3ab=25+3(36)=25+108=133.