1. x² - 3x - 28 = 0
2. D = 121
Penjelasan dengan langkah-langkah :
1. Persamaan kuadrat
(x - x₁)(x - x₂) = 0
(x - (-4))(x - 7) = 0
(x + 4)(x - 7) = 0
x² - 7x + 4x - 28 = 0
x² - 3x - 28 = 0
2. Diskriminan
a = 1, b = -3, c = -28
D = b² - 4ac
D = -3² - 4(1)(-28)
D = 9 - (-112)
D = 9 + 112
D = 121
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1. x² - 3x - 28 = 0
2. D = 121
Penjelasan dengan langkah-langkah :
1. Persamaan kuadrat
(x - x₁)(x - x₂) = 0
(x - (-4))(x - 7) = 0
(x + 4)(x - 7) = 0
x² - 7x + 4x - 28 = 0
x² - 3x - 28 = 0
2. Diskriminan
x² - 3x - 28 = 0
a = 1, b = -3, c = -28
D = b² - 4ac
D = -3² - 4(1)(-28)
D = 9 - (-112)
D = 9 + 112
D = 121