Question

2cos^2x+3cosx-2=0

Answer 1

Its like a polynomial. cosx=x
so it'll be like 2x^2+3x-2=0

Answer 2

is that factorable? with the plus in the middle how can you have a negative constant term.

Answer 3

\[(2x-1)(x+2)\]

Answer 4

which makes your life easy because you do not have to solve
\[\cos(x)=-2\] because it cannot be, so only solve
\[\cos(x)=\frac{1}{2}\]

Answer 5

thanks! you rock.