By either long or synthetic division, it's easy to show that

The quartic will be exactly divisible by

when the numerator of the remainder term vanishes, or for those values of

such that

I'm not sure how to count the number of solutions (software tells me it should be 80), but hopefully this is a helpful push in the right direction.
Answer:
Hi! your answer is A. -7/8x-3/2
Step-by-step explanation:
to find the slope of the line (-7/8) you count the x and y difference between the 2 points. It goes down 7 and right 8 units.
to find the y-intercept you just take it from the graph. The line crosses the y-axis at y=-3/2.
The side length has to be between 2 (=9-7) and 16 (=9+7). In both these corner cases the triangle will have collapsed to a line.
So the correct answers are B,C,D and E, and F is a corner case. Theoretically I suppose you have to count F in as a valid answer.
Try this option:
domain: x∈[-4;+∞); range: y∈[0;+∞).
32^3/5 = (2^5)^3/5 = 2^(5*3/5) = 2^3 = 8