Answer:
2x2 − 5x + 2
Explanation:
To find the solution, perform long division on the polynomial. 
 _2x2_-5x_+ 2_________
3x2 + 2 | 6x4 - 15x3 + 10x2 -10x + 4
 6x4 4x2
 ______________
 -15x3 + 6x2 -10x
 -15x3 + -10x
 _______________
 6x2 + 4
 6x2 + 4
 ___________
 0