Answer:

Step-by-step explanation:
we have

This is a vertical parabola open downward (the leading coefficient is negative)
The vertex is a maximum
The vertex is the point (h,k)
The range of the function is the interval (-∞,k]
so

Convert the quadratic equation in vertex form
Factor -1 leading coefficient

Complete the square


Rewrite as perfect squares

The vertex is the point (-1,4)
therefore
The range is 
Answer:
option c
Step-by-step explanation:
c doesnt follow a pattern
Answer:
1. Use the distributive property to get rid of any parenthesis.
2. Combine like terms
3. Move all variables to one side
4. Inverse operations