This is an irreducible quadratic.
The constant, by multiplying the first and last terms. In this equation, it is found like this:
[tex]9*-10=-90[/tex]
Now, in order for it to be factored, two factors of [tex]-90[/tex] must be equal to [tex]-5[/tex].
Since there are no two factors of [tex]-90[/tex] that equal [tex]-5[/tex], this is an irreducible quadratic.
