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Mathematics

Evaluate:

(3x2 + 5y2) (3x2 - 5y2)

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Answer

(3x2 + 5y2) (3x2 - 5y2)

Using the formula

[∵ (x + y)(x - y) = x2 - y2]

= (3x2)2 - (5y2)2

= 9x4 - 25y4

Hence, (3x2 + 5y2) (3x2 - 5y2) = 9x4 - 25y4

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