Question

______ - 10x2+9=(p2-9)(p2-1)

Answer 1

`p^4` or
`x^4` because you wrote
`.... -10x^2+9` instead of p

Explanation:

I'm going to assume (p2-9)(p2-1) is actually
`(p^2-9)(p^2-1)`

so if I expand it then,

`p^4-p^2-9p^2+9=p^4-10p^2+9`

So the missing part(blank)

is
`p^4` or is it
`x^4`