Answer:
2 * (12*a^7 * b^7)
Step-by-step explanation:
9a^2b^3+15a^5b^4
= 9a^2 * b^3 + 15a^5 * b^4
= 24a^7 * 2b^7
= 2 * (12*a^7 * b^7)
