Question

Find all solutions to the equation.

7 sin2x - 14 sin x + 2 = -5
help guys?

Answer 1

Welcome to OpenStudy!!

Answer 2

thanks

Answer 3

First things first, you want to treat sinx like a another variabe (say y), it'll make the problem a lot easier

Answer 4

It will then be
\[\Large 7y^2-14y+2=-5\]

Answer 5

If you add 5 to each sde, then you'll be left with
\[\Large 7y^2-14y+7=0\]

Answer 6

Alright, can you factor this out now?

Answer 7

alright, so y^2-2y+1=0

Answer 8

ok, so now can you factor that out?