271 rounded is 300, and 425 rounded is 400, so you could estimate the sum by adding 300 and 400, which equals 700.
X=0 or all real numbers and the minimum value would be 5
The right answer is -2/3
please see the attached picture for full solution
Hope it helps..
Good luck on your assignment..
9/xy + x^2/y = (9+x^3)/xy