IF a^2+b^2=z and ab=y, which of the foll...

IF `a^2+b^2=z` and ab=y, which of the following is equivalent to 4z+8y?

A

`(a+2b)^2`

B

`(2a+2b)^2`

C

`(4a+4b)^2`

D

`(4a+8b)^2`

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