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x²-10x+25=144
x²-10x+25-144=0
x²-10x-119=0
(x+7)(x-17)=0
x+7=0 x-17=0
x= -7 x=17
...........................................
2x²-8=0
2x²=8 dividimos todo entre 2
x²=4
√x²=√4
x=2 x= -2
............................................
x²+2x=35
x²+2x-35=0
(x+7)(x-5)=0
x+7=0 x-5=0
x= -7 x=5