Question

7 tan^3(x) - 21 tan(x) = 0

Can anybody explain how to do this?

Answer 1

First step. factor out tan x, you get tan x (7tan^2 x - 21) = 0

Answer 2

Set each factor equal to 0.

Answer 3

You take it from here.

Answer 4

Ohh, I think I got it, thanks! Just needed that starting boost. :)