Mark the critical points {{MATH_97}} and {{MATH_98}} on your plot. {{COMMENT_99}} {{CMD_100}} {{ENV_101}} {{COMMENT_102}} {{COMMENT_103}} {{CMD_104}} Since {{MATH_105}}, and both factors {{MATH_106}} and {{MATH_107}} are negative for {{MATH_108}}, it follows that {{MATH_109}}, and, therefore, our function is {{CMD_110}}{{CMD_111}}increasing{{CMD_112}} {{CMD_113}}decreasing{{CMD_114}}{{CMD_115}} on {{MATH_116}}.