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Dengan demikian, maka
4² = 2x² + 3x + 7 (sifat logaritma)
16 = 2x² + 3x + 7
0 = 2x² + 3x - 9
0 = (x+3) (2x-3)
x1 = -3 x2 =3/2
Jadi,
4x1 * x2 = 4 * (-3) * (3/2)
= -18