The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/68a9df99113ca18475e6b6c67d8faea5.gif" -- '\Large f'\''(-1) = 3 \cdot (-1)^2 - 3 = 0 \text{ and } f'\''(1) = 3 \cdot 1^2 - 3 = 0.'
returned status = 126
Image not found!
Please try the debugging script