Question

factor

x^2n-5x^n-36

Answer 1

y=x^n

now factor this:
y^2-5y-36

Answer 2

?

Answer 3

(y-9)(y+4)

now, let's put back the x^n instead of y:

(x^n - 9)( x^n + 4)

Answer 4

let me know if anything was unclear.