Jawaban:
Menggunakan rumus abc, karena sulit untuk difaktorkan
x²+7x-15 = 0
(x + 7/(2.1))² = 15 + (7/(2.1))²
(x + 7/2)² = 15 + 49/4
x = -7/2 ± 1/2 √(60+49)
x = 1/2 . (-7 ± √(109))
x = 1/2 . (-7 + √109) ∨ -1/2 . (7+√109)
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Jawaban:
Menggunakan rumus abc, karena sulit untuk difaktorkan
x²+7x-15 = 0
(x + 7/(2.1))² = 15 + (7/(2.1))²
(x + 7/2)² = 15 + 49/4
x = -7/2 ± 1/2 √(60+49)
x = 1/2 . (-7 ± √(109))
x = 1/2 . (-7 + √109) ∨ -1/2 . (7+√109)