Найдите верную группировку одночленов и разложите на множители:

\(\displaystyle \color{red}{10x^{\,13}}+20x^{\,5}-\color{red}{15x^{\, 9}}-6x^{\,4}+4x^{\,8}+\color{blue}{8}=\)

\(\displaystyle =(\color{red}{10x^{\,13}}-\color{red}{15x^{\, 9}}\)[?|+|-][ ]\(\displaystyle )+(\)[?||-][ ][?|+|-][ ]\(\displaystyle +\color{blue}{8})=\)

\(\displaystyle =\big(\)[ ]\(\displaystyle \big)\big(\)[ ]\(\displaystyle \big)\)