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49x² - 56x + 1 = 0
Sebenarnya akan sulit apabila difaktorkan.
Dengan menggunakan rumus ABC:
Sehingga didapat selesaian:
HP = {x | 1/7 (4 - √15), 1/7 (4 + √15) }
Nomor 2.
Sehingga,
HP = {x | -2/3, 1 }