-1(5x+1)
-5x-1
the (-) in front is just a short way to put (-1)
People need to stop typing I posted the answers to this link because it’s not happening
Answer:
D. (3. —1)
Step-by-step explanation:
Vertex of a quadratic function:
Suppose we have a quadratic function in the following format:

It's vertex is the point 
In which


Where

If a<0, the vertex is a maximum point, that is, the maximum value happens at
, and it's value is
.
Turning point of a quadratic function:
The turning point of a quadratic function is the vertex.
y = x2 — 6x + 8
This means that 
Now, we find the vertex.



(x,y) = (3,-1), and the correct answer is given by option D.
Answer: c
Step-by-step explanation: