\[Дано:\ \ b > 0.\]
\[b² + 8 > 0\]
\[(b - 8)^{2} \geq 0\]
\[- b^{2} - 1 < 0\]
\[(b - 4)^{2} + 1 > 0\]
\[b^{2} - 6b + 9 = (b - 3)^{2} \geq 0.\]