Answer:
my bad if im wrong but i got y=35
Step-by-step explanation:
Your answer can only be simplified to
256x^10 - 384^8 - 448^6
5.
First plug the value of x into the equation

then solve for y

6. Do the same steps
There are, 3 x 2 x 1 = 6 possible ways of arranging the three digits. Therefore in that set of 720 possibilities, each unique combination of three digits is represented 6 times. So there are 720 possible combinations.