Square of 9x - 7 xy is...

Square of `9x - 7 xy ` is

A

`81 x ^(2) + 49 x ^(2) y ^(2)`

B

`81 x ^(2) - 49 x ^(2)y ^(2)`

C

`81 x ^(2) + 49 x ^(2) y ^(2) - 126 x ^(2) y`

D

`81 x ^(2) + 49 x ^(2) y ^(2) - 63 x ^(2) y `

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The correct Answer is:

C

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