# Math Help - solve all values of x

1. ## solve all values of x

Solve for all values of x.

$2cos^2(x) + 3 sin(x) = 0$

How do i do these?

2. $2\cos^2(x) + 3 \sin(x) = 0$

Lets make that cos into sin

$2(1-\sin^2(x)) + 3 \sin(x) = 0$

Now expand that out, then make a sub $a = \sin(x)$ and solve the quadratic in a.