Question

(2x-4)(x+5)=0 I'm not sure hot find the role of zero.

Answer 1

`(2x-4)(x+5)=0`

happens if and only if one of the next options occurs

`\begin{gathered} 2x-4=0 \\ x+5=0 \end{gathered}`

Then, x can only be one of the next two options

`\begin{gathered} 2x-4=0 \\ 2x=4 \\ x=2 \end{gathered}`

or

`\begin{gathered} x+5=0 \\ x=-5 \end{gathered}`

In conclusion, the only two options for x to satisfy the equality are x=2 or x=-5