We can use distribution property to multiply the polynomial by the monomial.
$$ \begin{aligned} \left( x+11 \right) \cdot \left( \color{orangered}{-11} \right) &= x \cdot \color{orangered}{-11} + 11 \cdot \color{orangered}{-11} = \\ &= -11x-121 \end{aligned} $$