X=6
16 plus 2 is 18 and divided by 3 is 6
Answer:
The equation has a maximum value with a y-coordinate of -21.
Step-by-step explanation:
Given

Required
The true statement about the extreme value
First, write out the leading coefficient

means that the function would be a downward parabola;
Downward parabola always have their vertex on top of the parabola and as such, the function has a maximum value.
The maximum value is:

Where:

So, we have:



Substitute
in 


<em>Hence, the maximum is -21.</em>
(x + 4)^4 = x^4 + 16x^3 + 96x^2 + 256x + 256
10 I think or 10.476 I think that's the answer I just think