PNG  IHDR*_Q0PLTE@@@ftRNSS pHYsetEXtTitleInftyEditor MathImageytEXtAuthorAdministrator*gtEXtDescription $\mathbf{f}(\mathbf{x})=\mathbf{a}\mathbf{x}^{\mathbf{2}}+\mathbf{b}\mathbf{x}+\mathbf{c}$I:tEXtCopyrightInftyProject@$tEXtCreation Time r'rr'rr IDATxە @G4@X