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= 4x² + 16x + 16
cara cepetnya
(2x + 4)²
2x dipangkatkan 2 = 4x²
pangkat 2 dikali 2x dikali 4 = 16x
4 dipangkatkan 2 = 16
jadi 4x² + 16x + 16
hasil -2 diperoleh dari akar 4