(2) Pemfaktoran
3x²- 5x + 2 = 0
(x - 1) (3x - 2) = 0
x₁ = 1 atau x₂ = 2/3
(3) Rumus ABC
x₁ ,₂ = (- b ± √b² - 4ac) / 2a
x₁ ,₂ = (- (-5) ± √(-5)² - 4(3)(2) / 2(3)
x₁ ,₂ = (5 ± √25 - 24) / 6
x₁ ,₂ = (5 ± √1) / 6
x₁ ,₂ = (5 ± 1) / 6
x₁ = (5 + 1) / 6
x₁ = 1
atau
x₂ = (5 - 1) / 6
x₂ = 2/3
d. 2x² – x – 3 = 0
Jawab: (1) Kuadrat Sempurna
2x² - x - 3 = 0
x² - 1/2x - 3/2 = 0
x² - 1/2x + 1/16 = 1/16 + 3/2
(x - 1/4)² = 25/16
(x - 1/4)² = √25/16
(x - 1/4) = ±5/4
x₁ = 5/4 + 1/4
x₁ = 3/2