Question

9(a+2b)² -4×(3a-b) ²​

Answer 1

Step-by-step explanation:

9(a+2b)² - 4(3a-b)²

9(a²+4b²) - 4(9a-b²)

9a²+36b² - 36a-4b²

9a-36a+36b²-4b²

-27a+32b² (answer)

Hope this helps