a. x² – 1 = 0
b. 4x² + 4x + 1 = 0
c. -3x² – 5x + 2 = 0
d. 2x² – x – 3 = 0
e. x² – x + ¼ = 0
Kerjakan!!!
Tentukan akar persamaan kuadrat berikut.
Jawab:
Penjelasan dengan langkah-langkah:
a. x² – 1 = 0
(x – 1)(x + 1) = 0
x₁ = 1 dan x₂ = -1
b. 4x² + 4x + 1 = 0
(2x + 1)(2x + 1) = 0
2x = -1 dan 2x = -1
x₁ = -1/2 dan x₂ = -1/2
c. -3x² – 5x + 2 = 0
(-3x + 1)(x + 2) = 0
-3x = -1 dan x = -2
x₁ = -1/-3 dan x₂ = -2
d. 2x² – x – 3 = 0
(2x – 3)(x + 1) = 0
2x = 3 dan x = -1
x₁ = 3/2 dan x₂ = -1
e. x² – x + 1/4 = 0
(x – 1/2)(x – 1/2) = 0
x₁ = 1/2 dan x₂ = 1/2