2x^2-30x+100=0

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2x^2-30x+100=0
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2x^2-30x+100=0
2x^2-30x+100=0

2x^2-30x+100=0
2x^2-30x+100=0
(2x-10)(x-10)=0
x=5或10

5或10

(x-5)(x-10)=0,x=5,10

2边同除2
则:x^2-15x+50=0
(x-5)*(x-10)=0
x1=5
x2=10