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(2m-1)(m-3)=0
2m-1=0 m-3=0
2m=1 m=3
m=1/2 m=3
........................................................................................
b² - 10b+25=0
(b-5)(b-5)=0
(b-5)² trinomio cuadrado perfecto
solucion unica
b-5=0
b=5
.............................................................................
3x²-15x =0
x(3x-15)=0
x=0 3x-15=0
x=0 3x=15
x=0 x=15/3
x=0 x=5