Steps:
1. Graph all three points on the xy-plane.
2. Connect each point to form a triangle.
3. Use the formula A = (1/2)(base)(height)
Answer:
x = -2
-2(-2^2) + 4(-2)
-2(4) + -8
<h2>-8 + -8</h2><h2><em><u>
Answer = -16 is the answer.</u></em></h2>
Step-by-step explanation:

540/180=3+2=5 sides
It's a pentagon
Formula the sum of angles divide by 180 cuz a triangle equals 180 degrees then add 2.
Check below
So a 5 sided polygon known as a pentagon you subtract two. And it gives you 3 cuz it has 3 triangles in the pentagon that you can draw then 3 triangles times 180 = 540 degrees