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Question

Expand (x2)2 using suitable identity.

A
x24x+2
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B
x22x+4
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C
x24x+4
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D
x2+4x+4
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Solution

The correct option is C x24x+4
We know,
(xy)2 = x22xy+y2

Comparing we get x = x and y = 2
Hence (x2)2 = x22(x)(2)+(22)
x24x+4

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