Question

this is my sons math and I don't know how to simplify this

Answer 1

In order to simplify this expression, we need to use the distributive property:

$a(b+c)=ab+ac$

So, expanding the product, we have:

$\begin{gathered} -3n^3(-8n^3-3n^2) \\ =-3n^3(-8n^3)+(-3n^3)(-3n^2) \\ =24n^6+9n^5 \end{gathered}$