persamaan kuadrat a. x² + 4x - 15 :0
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Jawaban:
x² - 4x - 5 = 0
x² - 4x = 5
x² - 4x + ( -4/2)² = 5 + ( -4/2)²
( x - 2 )² = 5 + 4
( x - 2 )² = 9
x - 2 = ±√9
x - 2 = ± 3
x₁ = 2 + 3 = 5
x₂ = 2 - 3 = -1
Semoga Membantu Adik-Adik :)
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