(4a² - 15b²) (4a²+15b²)
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Answer:
(4a² - 15b²) (4a²+15b²)
Step-by-step explanation:
Applying (a-b)(a+b)=a²-b²
- (4a²)²-(15b²)²
- 16a⁴-225b⁴
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