sumplify. (3x-y+4) (3x-y-4)
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(3x)^2-(y)^2-4^2
9x-y^2-16
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Please see the attachment. I hope my answer is correct.
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![](https://hi-static.z-dn.net/files/d59/d2959edea445c9106d88901117f9ebc3.jpg)
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