Question

Find all solutions to the equation.

7 sin2x - 14 sin x + 2 = -5

Answer 1

lol. i know but i really need help

Answer 2

So you're trying to solve:\[7\sin^2x-14sinx+2=-5\]
If you know the quadratic formula you can solve for sin(x) where you would normally find the answer for x.

Answer 3

Actually no quadratic formula needed, you can FACTOR it! =D

Answer 4

oh is it like what @Kainui said

Answer 5

7 sin^2 (x) -14 sin(x) + 2 = -5

Answer 6

i got x=pi/2 +/- 2pi n

Answer 7

you can replace sin(x) with (u) then solve for (u)

Answer 8

Exactly TNNG.

Answer 9

thank you

Answer 10

Glad I could help! =)