Answer:
[tex]-6x^2 + 12x^3y^5[/tex]
Step-by-step explanation:
[tex]18x^2y + -24x^2y + 12x^3y^5\\-6x^2 + 12x^3y^5[/tex]
You need to combine the like terms, and the last term was not similar to the first two terms
