4) 1 – 4y² = 0
Y² = ¼
y₁ = - ½
y₂ = ½
5) 2x² – 6 = 0
x² = 3
x₁ = √3
x₂ = - √3
6) 2x²+ 3x = 0
X(2x + 3) = 0
X₁ = 0
2x + 3 = 0
x₂ = - 1,5
7) 3x² – 2 = 0
x² = 2/3
x₁ = √(2/3)
x₂ = - √(2/3)
8) 5u² – 4u = 0
U(5u – 4) = 0
u₁ = 0
5u – 4 = 0
u₂ =
4/5
9) 7a – 14a² = 0
7a(1 – 2a) = 0
a₁ = 0
1 – 2a = 0
a₂ = ½
10) 10x² + 7x = 0
X(10x + 7) = 0
x₁ = 0
10x + 7 = 0
x₂ = - 7/10