Вопрос:

Ответ:

\[28 - c^{2}\]

\[c = 12:\]

\[28 - 12^{2} = 28 - 144 = - 116.\]

\[c = 0:\]

\[28 - 0^{2} = 28 - 0 = 28.\]

\[c = - 1:\]

\[28 - ( - 10)^{2} = 28 - 10^{2} =\]

\[= 28 - 100 = - 72.\]