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What is the answer to the file attached

What is the answer to the file attached-example-1

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Answer:

(2x)^4 - (3y)4

Explanation:

using this identity a^2 - b^2 = (a + b )(a - b)

=(4x^2)^2 - (9y^2)^2

=(2x)^4 - (3y)4