factorise 9(a-2)^2 -16(a+2)^2
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Answer:
-7a² - 100a - 28
Step-by-step explanation:
9(a - 2)² - 16(a + 2)²
9( a² - 4a + 4) - 16( a² + 4a + 4)
9a² - 36a + 36 - 16a² - 64a - 64
- 7a² - 100a - 28
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