I’ll answer, but wait, do I send a picture of my work? or not? It says I have to make a table of values, so
You need to find the area of the hexagon, and the area of the triangle.
The formula for the area of a triangle is

I hope this helps you a little.
Given: y²+5y
Converting y²+5y in the form: x²+2ax+a²
Here 2a=5 or a=5/2
Add and subtract (5/2)²
y²+5y+(5/2)²-(5/2)²
Complete the square.
(y+5/2)²-(5/2)²
Simplify
(y+5/2)² - 25/4
Answer: (y+5/2)² - 25/4
To convert to a decimal, divide by 100.
75 / 100 = .75