1. x2-6x + 5 =0
x^2 - 6x + 9 - 9 + 5 = 0
(x-3)^2 -4 = 0
(x-3)^2 = 4
x-3 = ±2
x1,2 = 3±2
x1 = 5
x2 = 1
2. x2+3x - 1 = 0
x^2 + 3x + 1.5^2 - 1.5^2 - 1 = 0
(x+1.5)^2 - 3.25 = 0
(x+1.5)^2 = 3.25
x+1.5 = ±√3.25
x1,2 = -1.5 ±√3.25
x1 = -1.5 + √3.25
x2 = -1.5 - √3.25
Kontrolliere mal bis hier hin. Taschenrechner kannst du dann selbst einsetzen(?)