Step 1: First we have to write polynomials in descending order.
$$ \begin{aligned} P(x) &= -4x-2 \\ Q(x) &= 0 \\ \end{aligned} $$We can use distribution property to multiply the polynomial by the monomial.
$$ \begin{aligned} \left( -4x-2 \right) \cdot \color{orangered}{0} &= \left( -4x\right) \cdot \color{orangered}{0} + \left( -2\right) \cdot \color{orangered}{0} = \\ &= 0 \end{aligned} $$