Homework Post L Score 0 of 1 pt 7113 Factor and simplify 3 c

Homework: Post L Score: 0 of 1 pt 7.1.13 Factor and simplify 3 cos X + cos x - 4 3 cos*x + cos x-4 = (Simplify your answe pje ets nts

Solution

3cos²x +cosx -4

=(3cos²x -3cosx)+(4cosx -4)

=>(3cosx(cosx-1))+(4(cosx-1))

=>(cosx-1)(3cosx +4)

therefore 3cos²x +cosx -4 =(3cosx +4)(cosx-1)