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x = (30.12)/40=9
2. p^2 - 2pq + q^2
=(2-√5)^2 - 2(2-√5)(2+√5) + (2+√5)^2
=9-4√5 - 2(2-√5)(2+√5) + 9+4√5
=18+2-4√5+4√5
=20
30x12/40 = 360/40 = 9 .
maaf klw mungkin jwbn nya salah .