Question

f(x)= 4 tan x
Solve f(x)=-4

Answer 1

set it up as 4tanx = -4

Answer 2

I did, I don't know what to do afterwards.

Answer 3

try and get the tanx by itself

Answer 4

So tanx=-1

Answer 5

correct now how do you find what x is if you know what the trig function is equal to?

Answer 6

Do I do inverse of tangent to both sides? o_o

Answer 7

remember that tanx is equal to y/x or rise over run on a triangle

Answer 8

Sorry, I'm lost. T~T

Answer 9

it's ok 1 secound

Answer 10

ok so you're looking for the Θ and you have found that y/x is equal to -1. if we use the unit circle we'll see that y/x is -1 at 2 places.

Answer 11

Yeah pi/4 and 5pi/4 right?

Answer 12

not quite but very close those are where tanx = 1

Answer 13

so 3pi/4 and 7pi/4?

Answer 14

correct!

Answer 15

So x=3pi/4 and 7pi/4, that's it?