Question

(x+1)(x-4)>0

Answer 1

You want us to expand it or just want the roots? The roots are -1 and 4.

Answer 2

x > 4, x < -1

Answer 3

why is it -1 and 4 ? why isnt it 1 and -4

Answer 4

-1 + 1 = 0, 4 - 4 = 0, you want them to = 0. So you figure out what makes it = 0 and those are your roots. Without getting technical that is.