求解[80-2(x-10)]x=1200thanks

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求解[80-2(x-10)]x=1200thanks
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求解[80-2(x-10)]x=1200thanks
求解[80-2(x-10)]x=1200
thanks

求解[80-2(x-10)]x=1200thanks
(80-2x+20)x=1200
-2x²+100x=1200
x²-50x+600=0
(x-20)(x-30)=0
x=20,x=30