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Can anyone say me the answer from 4 d​

Can anyone say me the answer from 4 d​-example-1

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Answer:

(a² + b² + 3ab)(a² + b² - 3ab)

Explanation:

a⁴ - 7a²b² + b⁴

= (a⁴ + 2a²b² + b⁴) - 9a²b²

= (a²+b²)² - (3ab)²

= (a² + b² + 3ab)(a² + b² - 3ab)

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