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Berhubung akarnya telah diketahui.
x = 2
a(2)² - 3(2) + 7 = 0
4a - 6 + 7 = 0
4a + 1 = 0
4a = -1
a = -1/4
Nomor 2.
Menggunakan rumus ABC.
a = 2, b= 6, c = 1
Didapat:
Didapat akar persamannya:
x = 1/2 (-3+√6)
x = 1/2 (-3-√6)