Answer:
2 x^3 ( x-3)
----------------------------
5 (x+3)
Step-by-step explanation:
12 x^4 ( x-3) (x+5)
----------------------------
30x (x+3) (x+5)
Cancel the x+5
12 x^4 ( x-3)
----------------------------
30x (x+3)
Rewriting 12x^4 and 30x
6*2 x^3 *x ( x-3)
----------------------------
6*5 x (x+3)
Canceling 6x
2 x^3 ( x-3)
----------------------------
5 (x+3)
