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2 x^{2} + 9 x^{2} + 4 =0
11 x^{2} + 4 = 0 x = \sqrt{x} (4/11)
Mungkin soal yang benar adalah sbb:
2 x^{2} + 9x + 4 = 0
(2x + 1)(x + 4) = 0
x1 = -1/2
x2 = -4[/tex]