The function {{MATH_155}} has {{MATH_156}} inflection point(s). {{CMD_157}} Since {{MATH_158}} {{MATH_159}} is {{CMD_160}}{{CMD_161}}positive{{CMD_162}}{{CMD_163}}negative{{CMD_164}}{{CMD_165}} on {{MATH_166}}. {{CMD_167}} Since {{MATH_168}} for all {{MATH_169}}, {{MATH_170}} is {{CMD_171}}{{CMD_172}}concave up{{CMD_173}}{{CMD_174}}concave down{{CMD_175}}{{CMD_176}} on {{MATH_177}}. {{CMD_178}} {{CMD_179}} {{CMD_180}} {{CMD_181}} {{CMD_182}} {{CMD_183}} {{CMD_184}} {{CMD_185}} {{CMD_186}} {{CMD_187}} {{CMD_188}} {{CMD_189}} {{CMD_190}} {{CMD_191}} {{CMD_192}} {{CMD_193}}