How do you simplify 2cos^2x + cosx -32cos2x+cosx3?

1 Answer
Nov 13, 2015

Simplify f(x) = 2cos^2 x + cos x - 3

f(x) = (cos x - 1)(2cos x + 3)

Explanation:

f(x) = 2cos^2 x + cos x - 3.f(x)=2cos2x+cosx3.
Since a + b + c = 0, the 2 factors are: (cos x - 1)(cosx1) and
(cos x + c/a) = (cos x + 3/2)(cosx+ca)=(cosx+32)
f(x) = (cos x - 1)(2cos x + 3)