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Which of the following expressions is eq...

Which of the following expressions is equivalent to `49x^(2) + 81` ?

A

`(7x + 9)^(2)`

B

`(7x + 9i)^(2)`

C

`(7x - 9i)^(2)`

D

`(7x - 9i)(7x + 9i)`

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The correct Answer is:
D
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