Hello there!
The only thing we need to do to get this polynomial in standard form is rearrange the terms!
x+7-4x^3
-4x^3+x+7 is the polynomial written in standard form. Remember to keep track of the negatives!
The GCF of the polynomial
24x^5+18x^9 is...
6x^5
Because it is the greatest term that goes into both 24x^5 AND 18x^9!
This will end up helping you factor later on.
6x^5(4+3x^4)
I really hope this helps!
Best wishes :)