Hierkan n man gut das Distibutivgestz anwenden:
a) x²-4x=0 x( x-4)= 0 x1=0 x2=4
x²-4= 0 x 1,2= ±√4 x1=2 x2= -2
b) 4z²-1= 0 z²= 1/4 z1,2=±√(1/4) z1,2=±1/2
4z²-z= 0 z(4z-1)=0 z1=0 ; 4z=1 z2= 1/4
c) 3y²-12=0 | +12, /3
y²=4 y1,2=±2
-5x²+1/5=0 | /(-5)
x²-1/25=0 | +1/25
x²=1/25 x1,2=±1/5