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x²-5x=10x
x²-5x-10x=0
x²-15x=0
donde a=1 b= -15 c=0
-b + o - √b²-4ac.......-(-15) + o - √-15²-4(1)(0)...........15 + o - √225
2a 2(1) 2
x1= 15+√225...........x1=15+15 ......x1= 30 ..........x1=15
2 2 2
x2=15-√225..........x2=15-15.........x2= 0 ............x2=0
2 2 2
las dos soluciones son x=15 x=0
la edad de la persona es 15 años