Question

HELP
x^3 + 4x < 5x^2
Whats the interval notation set?
I got
x^3 - 5x^2 + 4x <0
x(x-4)(x-1)<0
so....
X<0?
x<4?
x<1?
Help please

Answer 1

(-infinity, 0) u (0,1) u (1,4) <-- i got from trying out numbers

Answer 2

close... roots are 0,1 and 4
check the intervals (-inf,0) (0,1) (1,4) (4, +inf)
(check (0,1) again )

Answer 3

0 and 1 isnt going to work if you substitute..OH. haha it did'nt work.

(4, + inf) isn't gonna work if you substitute it.
i tried 6 and 7 and it didnt work.
Thanks

Answer 4

Just ( -inf, 0 ) and ( 1, 4)

Answer 5

Awesome! Thanks