Answer:
I think it will be the first one because as we can see the points are going up which tells us the line would be positive.
For any triangle, the 2 shortest sides added together have to be longer than the longest sides.
short side (10) + short side (5) needs to be greater than (>) longest side (20)
10 + 5 > 20
15 > 20
This inequality is incorrect, so the lengths cannot make a triangle.
Hope this helps :)
Because all are a multiple of 2, you can factor out 2, 2(-x^2+x+2)=0
