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Question

Expand: [3x25y]2



A

3x2256x+225

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B

3x26x y5+225y2

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C

3x26x+425

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D

x2256x+425

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Solution

The correct option is D

3x26x y5+225y2


Given: [3x25y]2
Using this identity,  (ab)2=a22ab+b2

[3x25y]2
=(3x)22(3x×25y)+(25y)2
=3x26x y5+225y2


Mathematics

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