Question

How do you simplify `2cos^2x + cosx -3`?

Answer 1

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.`
Since a + b + c = 0, the 2 factors are: `(cos x - 1)` and
`(cos x + c/a) = (cos x + 3/2)`
f(x) = (cos x - 1)(2cos x + 3)