Given:
cos 120°
To find:
The exact value of cos 120° in simplest form with a rational denominator.
Solution:
We have,

It can be written as

![[\because \cos (90^\circ-\theta)=-\sin \theta]](https://tex.z-dn.net/?f=%5B%5Cbecause%20%5Ccos%20%2890%5E%5Ccirc-%5Ctheta%29%3D-%5Csin%20%5Ctheta%5D)
![[\because \sin 30^\circ=\dfrac{1}{2}]](https://tex.z-dn.net/?f=%5B%5Cbecause%20%5Csin%2030%5E%5Ccirc%3D%5Cdfrac%7B1%7D%7B2%7D%5D)

Therefore, the exact value of cos 120° is
.
Find the factors
The factor is -2
Finally equation:
(x-2)(x-2)
yeah i dont understand what that even means.
Answer:
Maximum value:
the maximum value is 
Minimum value:
the minimum value is 7
Step-by-step explanation:
We are given function as

Firstly, we will draw graph
we can see the graph
and then we can identify maximum and minimum
Maximum value:
We know that
the largest y-value means maximum value of f(x)
We can see that curve is moving upward
so, the maximum value is 
Minimum value:
We know that
the smallest y-value means minimum value of f(x)
we can see that
It starts from point (5,7)
so, the minimum value is 7