


This Question is Closed

apple_pi
Best Response
You've already chosen the best response.
1
let u = sin(x)
2u^2 + u  1 = 0

apple_pi
Best Response
You've already chosen the best response.
1
Can you solve this?

erynm
Best Response
You've already chosen the best response.
0
could you expand to the next step?

nabsz.j
Best Response
You've already chosen the best response.
0
can't you just solve as a quadratic ... or cant you roll this way because its trig?

Lizzardo
Best Response
You've already chosen the best response.
1
next step:
factorise:
(2u1)(u+1)=0
thus
2u1 = 0 or u+1=0
u=1/2 u=1
now sub back sinx

apple_pi
Best Response
You've already chosen the best response.
1
is your domain for x specified?

Lizzardo
Best Response
You've already chosen the best response.
1
sinx = 1/2 or sinx=1 now solve for x

erynm
Best Response
You've already chosen the best response.
0
ahh, got it! I didn't realize it was a quadratic. Thank you so much!