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a. x² - 1 = 0
Jawab: (1) Kuadran Sempurna
x² - 1 = 0
x² = 1
x = √1
x = ±1
x₁ = 1 atau x₂ = -1
(2) Pemfaktoran
x² - 1 = 0
(x - 1) (x + 1) = 0
x₁ = 1 atau x₂ = -1
(3) Rumus ABC
x₁ ,₂ = (- b ± √b² - 4ac) / 2a
x₁ ,₂ = (- 0 ± √0² - 4(1)(-1)) / 2(1)
x₁ ,₂ = ± √4 / 2
x₁ ,₂ = ± 1
x₁ = 1 atau x₂ = -1
b. 4x² + 4x + 1 = 0
Jawab: (1) Kuadrat Sempurna
4x² + 4x + 1 = 0
4x² + 4x + 1 = -1 + 21
(2x + 1)² = 0
(2x + 1) = 0
x₁ = -1/2 atau x₂ = -1/2
