81 + 36 X + 4 x square
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Answer:
=81×81+36x×36x+4x×4x+2 (81×36x+36x×4x+4x×81)
=6561+1296x2+16x2+2 (2916x+144x2+324x)
=6561+1312x2+5832x+288x2+648x
=1600x2+648x+6561
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