Question

Looking for an answer to all of the following in the picture but especially question 7

Answer 1

Given

`3x^3+10x^2-x-12`

Answer

X-3 is factor if for x =3 , above expression is 0

`\begin{gathered} 3(3)^3+10(3)^2-3-12 \\ 81+270-15=336\\e0 \\ \end{gathered}`

So x-3 is not a factor,