trig question from cambridge prelim 3U (1 Viewer)

[h3ll h0und]

iv had a mental blank today....and im stuck with this question :

sec^2 (x) - 2tanx - 4 = 0 solve for 0'_< x_<360'

its prolly really basic but as i said iv got a mental blank

thanx in advance

 

[Timothy.Siu]

sec ^2 x=1+tan^2 x

 

[h3ll h0und]

oh yea....my bad...
kk i can work out the rest thanx....i need to memorise the trig identities properly x(

 

[Timothy.Siu]

lol yeah its just practise