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=> (x-3) (x-3)
=> x^2 - 3x - 3x -9
=> x^2 - 6x - 9
2) (2x+4)^4
=> (2x+4) (2x+4)
=> 4x^2 + 8x + 8x + 16
=> 4x^2 + 16x + 16
Rumusnya : kiri + luar + dalam + kanan
keterangan : tanda (^) adalah pangkat