9(a+2b)² -4×(3a-b) ²
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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
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