16x4+36x2y2+81y4

Dear student
There seems to be some mistake in question.
As per my interpretation the question will be 16x4+72x2y2+81y4
We have16x4+72x2y2+81y4=4x22+2×4x2×9y2+9y22=4x2+9y22Note:a+b2=a2+b2+2ab

Regards

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