(x+2)(x+4) = x² + 4x+ 2x + 8 = x² + 6x + 8
Jadi,
x² + 6x + 8 = 0
(mengunakan sistem kali pelangi)
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(x+2)(x+4) = x² + 4x+ 2x + 8 = x² + 6x + 8
Jadi,
x² + 6x + 8 = 0
(mengunakan sistem kali pelangi)