Here, we want to multiply the two given polynomials
To do this, we will need to expand the bracket by multiplying the outside term by each of the inner term before adding
This is basically the distributive approach
Thus, we have that;
[tex]\begin{gathered} y(x+5)\text{ = (y}\times x)+(y\times5) \\ =\text{ xy + 5y} \end{gathered}[/tex]