Answer:
-10x^2 +9+8x^2-5x+7=-2x^2-5x+16
We'll use the notation
for the principal value and
for all the values:

Part I


Part II. In our range we can write


Part III.

Part IV.


I don't know how to solve this but you can go to desmos.com and it will graph it for you.
Hope this helps make your life easier!
Answer:
Area = L²-5L
Step-by-step explanation:
Area = length * width
Length = L
Width = L - 5
Area = L * (L-5) = L²-5L
We cannot see the triangle