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(x-8)(x-8)=0
(x-8)²=0
√(x-8)²=√0
x-8=0
x=8
x₁=8 x₂=8
en este tipo de ecuaciones cuadraticas,la solucion es repetida
..................................
x²-10x+25=0
(x-5)(x-5)=0
(x-5)²=0
√(x-5)²=√0
x-5=0
x=5
x₁=5 x₂=5
.....................................................