Найдите верную группировку одночленов и разложите на множители:
\(\displaystyle -28z^{\,12}-\color{blue}{63z^{\,8}}+24z^{\,7}+54z^{\,3}-\color{red}{20z^{\,4}}-\color{blue}{45}=\)
\(\displaystyle =(\)[?||-][ ][?|+|-][ ]\(\displaystyle -\color{red}{20z^{\,4}})+(\color{blue}{-63z^{\,8}}\)[?|+|-][ ]\(\displaystyle -\color{blue}{45})=\)
\(\displaystyle =\big(\)[ ]\(\displaystyle \big)\big(\)[ ]\(\displaystyle \big)\)